77534131 has 4 divisors (see below), whose sum is σ = 80035264. Its totient is φ = 75033000.

The previous prime is 77534123. The next prime is 77534143. The reversal of 77534131 is 13143577.

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 77534131 - 2³ = 77534123 is a prime.

It is a super-2 number, since 2×77534131² = 12023082939850322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 2501101 = 77534131 / (7 + 7 + 5 + 3 + 4 + 1 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77534093 and 77534102.

It is not an unprimeable number, because it can be changed into a prime (77534101) 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, 1250520 + ... + 1250581.

It is an arithmetic number, because the mean of its divisors is an integer number (20008816).

Almost surely, 2^77534131 is an apocalyptic number.

77534131 is a deficient number, since it is larger than the sum of its proper divisors (2501133).

77534131 is a wasteful number, since it uses less digits than its factorization.

77534131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2501132.

The product of its digits is 8820, while the sum is 31.

The square root of 77534131 is about 8805.3467279829. The cubic root of 77534131 is about 426.4135282977.

The spelling of 77534131 in words is "seventy-seven million, five hundred thirty-four thousand, one hundred thirty-one".