77315631 has 4 divisors (see below), whose sum is σ = 103087512. Its totient is φ = 51543752.

The previous prime is 77315629. The next prime is 77315647. The reversal of 77315631 is 13651377.

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 77315631 - 2¹ = 77315629 is a prime.

It is a super-2 number, since 2×77315631² = 11955413593856322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77315592 and 77315601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77313631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12885936 + ... + 12885941.

It is an arithmetic number, because the mean of its divisors is an integer number (25771878).

Almost surely, 2^77315631 is an apocalyptic number.

77315631 is a deficient number, since it is larger than the sum of its proper divisors (25771881).

77315631 is a wasteful number, since it uses less digits than its factorization.

77315631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25771880.

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

The square root of 77315631 is about 8792.9307400889. The cubic root of 77315631 is about 426.0125908245.

The spelling of 77315631 in words is "seventy-seven million, three hundred fifteen thousand, six hundred thirty-one".