816560139 has 8 divisors (see below), whose sum is σ = 1089382032. Its totient is φ = 544055840.

The previous prime is 816560123. The next prime is 816560149. The reversal of 816560139 is 931065618.

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 816560139 - 2⁴ = 816560123 is a prime.

It is a super-3 number, since 3×816560139³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 816560097 and 816560106.

It is not an unprimeable number, because it can be changed into a prime (816560149) 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, 73332 + ... + 83729.

It is an arithmetic number, because the mean of its divisors is an integer number (136172754).

Almost surely, 2^816560139 is an apocalyptic number.

816560139 is a deficient number, since it is larger than the sum of its proper divisors (272821893).

816560139 is a wasteful number, since it uses less digits than its factorization.

816560139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158797.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 816560139 is about 28575.5164257796. The cubic root of 816560139 is about 934.6795164983.

The spelling of 816560139 in words is "eight hundred sixteen million, five hundred sixty thousand, one hundred thirty-nine".