31275386977 has 4 divisors (see below), whose sum is σ = 31277076480. Its totient is φ = 31273697476.

The previous prime is 31275386963. The next prime is 31275387023. The reversal of 31275386977 is 77968357213.

It is a happy number.

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: 77968357213 = 2767 ⋅28177939.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31275386977 is a prime.

It is a super-2 number, since 2×31275386977² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31275386377) 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, 816673 + ... + 854110.

It is an arithmetic number, because the mean of its divisors is an integer number (7819269120).

Almost surely, 2^31275386977 is an apocalyptic number.

It is an amenable number.

31275386977 is a deficient number, since it is larger than the sum of its proper divisors (1689503).

31275386977 is a wasteful number, since it uses less digits than its factorization.

31275386977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689502.

The product of its digits is 13335840, while the sum is 58.

The spelling of 31275386977 in words is "thirty-one billion, two hundred seventy-five million, three hundred eighty-six thousand, nine hundred seventy-seven".