816087613 has 4 divisors (see below), whose sum is σ = 890277408. Its totient is φ = 741897820.

The previous prime is 816087599. The next prime is 816087647. The reversal of 816087613 is 316780618.

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.

It is a cyclic number.

It is not a de Polignac number, because 816087613 - 2⁹ = 816087101 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 (816087673) 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, 37094881 + ... + 37094902.

It is an arithmetic number, because the mean of its divisors is an integer number (222569352).

Almost surely, 2^816087613 is an apocalyptic number.

It is an amenable number.

816087613 is a deficient number, since it is larger than the sum of its proper divisors (74189795).

816087613 is a wasteful number, since it uses less digits than its factorization.

816087613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74189794.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 816087613 is about 28567.2472072477. The cubic root of 816087613 is about 934.4991886520.

The spelling of 816087613 in words is "eight hundred sixteen million, eighty-seven thousand, six hundred thirteen".