77951131 has 4 divisors (see below), whose sum is σ = 79763992. Its totient is φ = 76138272.

The previous prime is 77951123. The next prime is 77951147. The reversal of 77951131 is 13115977.

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

It is a cyclic number.

It is not a de Polignac number, because 77951131 - 2³ = 77951123 is a prime.

It is a super-2 number, since 2×77951131² = 12152757648358322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77951191) 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, 906366 + ... + 906451.

It is an arithmetic number, because the mean of its divisors is an integer number (19940998).

Almost surely, 2^77951131 is an apocalyptic number.

77951131 is a deficient number, since it is larger than the sum of its proper divisors (1812861).

77951131 is a wasteful number, since it uses less digits than its factorization.

77951131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812860.

The product of its digits is 6615, while the sum is 34.

The square root of 77951131 is about 8828.9937705267. The cubic root of 77951131 is about 427.1766185208.

The spelling of 77951131 in words is "seventy-seven million, nine hundred fifty-one thousand, one hundred thirty-one".