1818431481 has 8 divisors (see below), whose sum is σ = 2458724544. Its totient is φ = 1195213040.

The previous prime is 1818431477. The next prime is 1818431539. The reversal of 1818431481 is 1841348181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1818431481 - 2² = 1818431477 is a prime.

It is a super-2 number, since 2×1818431481² = 6613386102183706722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1818431441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4268406 + ... + 4268831.

It is an arithmetic number, because the mean of its divisors is an integer number (307340568).

Almost surely, 2^1818431481 is an apocalyptic number.

It is an amenable number.

1818431481 is a deficient number, since it is larger than the sum of its proper divisors (640293063).

1818431481 is an equidigital number, since it uses as much as digits as its factorization.

1818431481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8537311.

The product of its digits is 24576, while the sum is 39.

The square root of 1818431481 is about 42643.0707266726. The cubic root of 1818431481 is about 1220.5783070769.

The spelling of 1818431481 in words is "one billion, eight hundred eighteen million, four hundred thirty-one thousand, four hundred eighty-one".