31021012097 has 4 divisors (see below), whose sum is σ = 31113062916. Its totient is φ = 30928961280.

The previous prime is 31021012063. The next prime is 31021012129. The reversal of 31021012097 is 79021012013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79021012013 = 7673 ⋅10298581.

It can be written as a sum of positive squares in 2 ways, for example, as 8986281616 + 22034730481 = 94796^2 + 148441^2 .

It is a cyclic number.

It is not a de Polignac number, because 31021012097 - 2⁸ = 31021011841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31021012037) 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, 46024904 + ... + 46025577.

It is an arithmetic number, because the mean of its divisors is an integer number (7778265729).

Almost surely, 2^31021012097 is an apocalyptic number.

It is an amenable number.

31021012097 is a deficient number, since it is larger than the sum of its proper divisors (92050819).

31021012097 is an equidigital number, since it uses as much as digits as its factorization.

31021012097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92050818.

The product of its (nonzero) digits is 756, while the sum is 26.

The spelling of 31021012097 in words is "thirty-one billion, twenty-one million, twelve thousand, ninety-seven".