77136531 has 8 divisors (see below), whose sum is σ = 108898704. Its totient is φ = 48399360.

The previous prime is 77136529. The next prime is 77136551. The reversal of 77136531 is 13563177.

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

It is not a de Polignac number, because 77136531 - 2¹ = 77136529 is a prime.

It is a super-2 number, since 2×77136531² = 11900088829427922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 77136492 and 77136501.

It is not an unprimeable number, because it can be changed into a prime (77136511) 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, 756190 + ... + 756291.

It is an arithmetic number, because the mean of its divisors is an integer number (13612338).

Almost surely, 2^77136531 is an apocalyptic number.

77136531 is a deficient number, since it is larger than the sum of its proper divisors (31762173).

77136531 is a wasteful number, since it uses less digits than its factorization.

77136531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512501.

The product of its digits is 13230, while the sum is 33.

The square root of 77136531 is about 8782.7405176289. The cubic root of 77136531 is about 425.6833868207.

The spelling of 77136531 in words is "seventy-seven million, one hundred thirty-six thousand, five hundred thirty-one".