77312031 has 8 divisors (see below), whose sum is σ = 103127424. Its totient is φ = 51519000.

The previous prime is 77312029. The next prime is 77312051. The reversal of 77312031 is 13021377.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77312031 - 2¹ = 77312029 is a prime.

It is a super-2 number, since 2×77312031² = 11954300274689922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77311992 and 77312010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77312021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5790 + ... + 13716.

It is an arithmetic number, because the mean of its divisors is an integer number (12890928).

Almost surely, 2^77312031 is an apocalyptic number.

77312031 is a deficient number, since it is larger than the sum of its proper divisors (25815393).

77312031 is a wasteful number, since it uses less digits than its factorization.

77312031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11181.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 77312031 is about 8792.7260278028. The cubic root of 77312031 is about 426.0059786681.

The spelling of 77312031 in words is "seventy-seven million, three hundred twelve thousand, thirty-one".