1818051413 has 4 divisors (see below), whose sum is σ = 1821202860. Its totient is φ = 1814899968.

The previous prime is 1818051407. The next prime is 1818051419. The reversal of 1818051413 is 3141508181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3141508181 = 7 ⋅448786883.

It is an interprime number because it is at equal distance from previous prime (1818051407) and next prime (1818051419).

It can be written as a sum of positive squares in 2 ways, for example, as 1770137329 + 47914084 = 42073^2 + 6922^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818051413 - 2¹⁶ = 1817985877 is a prime.

It is a super-2 number, since 2×1818051413² = 6610621880622593138, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1818051413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818051419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1574858 + ... + 1576011.

It is an arithmetic number, because the mean of its divisors is an integer number (455300715).

Almost surely, 2^1818051413 is an apocalyptic number.

It is an amenable number.

1818051413 is a deficient number, since it is larger than the sum of its proper divisors (3151447).

1818051413 is an equidigital number, since it uses as much as digits as its factorization.

1818051413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151446.

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 1818051413 is about 42638.6141074027. The cubic root of 1818051413 is about 1220.4932639899.

Adding to 1818051413 its reverse (3141508181), we get a palindrome (4959559594).

The spelling of 1818051413 in words is "one billion, eight hundred eighteen million, fifty-one thousand, four hundred thirteen".