31290977 has 4 divisors (see below), whose sum is σ = 31347120. Its totient is φ = 31234836.

The previous prime is 31290953. The next prime is 31290989. The reversal of 31290977 is 77909213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77909213 = 179 ⋅435247.

It is a cyclic number.

It is not a de Polignac number, because 31290977 - 2¹⁰ = 31289953 is a prime.

It is a super-2 number, since 2×31290977² = 1958250483229058, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31290977.

It is not an unprimeable number, because it can be changed into a prime (31290277) 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, 27227 + ... + 28352.

It is an arithmetic number, because the mean of its divisors is an integer number (7836780).

Almost surely, 2^31290977 is an apocalyptic number.

It is an amenable number.

31290977 is a deficient number, since it is larger than the sum of its proper divisors (56143).

31290977 is an equidigital number, since it uses as much as digits as its factorization.

31290977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56142.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 31290977 is about 5593.8338373606. The cubic root of 31290977 is about 315.1178764348.

The spelling of 31290977 in words is "thirty-one million, two hundred ninety thousand, nine hundred seventy-seven".