77191365131 has 4 divisors (see below), whose sum is σ = 77191987752. Its totient is φ = 77190742512.

The previous prime is 77191365079. The next prime is 77191365133. The reversal of 77191365131 is 13156319177.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 77191365131 - 2⁶ = 77191365067 is a prime.

It is a super-2 number, since 2×77191365131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77191365133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55001 + ... + 396746.

It is an arithmetic number, because the mean of its divisors is an integer number (19297996938).

Almost surely, 2^77191365131 is an apocalyptic number.

77191365131 is a deficient number, since it is larger than the sum of its proper divisors (622621).

77191365131 is a wasteful number, since it uses less digits than its factorization.

77191365131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622620.

The product of its digits is 119070, while the sum is 44.

The spelling of 77191365131 in words is "seventy-seven billion, one hundred ninety-one million, three hundred sixty-five thousand, one hundred thirty-one".