77911131 has 4 divisors (see below), whose sum is σ = 103881512. Its totient is φ = 51940752.

The previous prime is 77911073. The next prime is 77911133. The reversal of 77911131 is 13111977.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 77911131 - 2¹³ = 77902939 is a prime.

It is a super-2 number, since 2×77911131² = 12140288667398322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77911133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12985186 + ... + 12985191.

It is an arithmetic number, because the mean of its divisors is an integer number (25970378).

Almost surely, 2^77911131 is an apocalyptic number.

77911131 is a deficient number, since it is larger than the sum of its proper divisors (25970381).

77911131 is a wasteful number, since it uses less digits than its factorization.

77911131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25970380.

The product of its digits is 1323, while the sum is 30.

The square root of 77911131 is about 8826.7282160493. The cubic root of 77911131 is about 427.1035385965.

The spelling of 77911131 in words is "seventy-seven million, nine hundred eleven thousand, one hundred thirty-one".