1816337213 has 4 divisors (see below), whose sum is σ = 1874928768. Its totient is φ = 1757745660.

The previous prime is 1816337203. The next prime is 1816337219. The reversal of 1816337213 is 3127336181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3127336181 = 30803 ⋅101527.

It is a cyclic number.

It is not a de Polignac number, because 1816337213 - 2¹² = 1816333117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816337219) 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, 29295731 + ... + 29295792.

It is an arithmetic number, because the mean of its divisors is an integer number (468732192).

Almost surely, 2^1816337213 is an apocalyptic number.

It is an amenable number.

1816337213 is a deficient number, since it is larger than the sum of its proper divisors (58591555).

1816337213 is an equidigital number, since it uses as much as digits as its factorization.

1816337213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58591554.

The product of its digits is 18144, while the sum is 35.

The square root of 1816337213 is about 42618.5078692345. The cubic root of 1816337213 is about 1220.1095514362.

The spelling of 1816337213 in words is "one billion, eight hundred sixteen million, three hundred thirty-seven thousand, two hundred thirteen".