31397079 has 32 divisors (see below), whose sum is σ = 52310016. Its totient is φ = 16335360.

The previous prime is 31397077. The next prime is 31397083. The reversal of 31397079 is 97079313.

It is not a de Polignac number, because 31397079 - 2¹ = 31397077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31397077) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9649 + ... + 12485.

It is an arithmetic number, because the mean of its divisors is an integer number (1634688).

Almost surely, 2^31397079 is an apocalyptic number.

31397079 is a deficient number, since it is larger than the sum of its proper divisors (20912937).

31397079 is a wasteful number, since it uses less digits than its factorization.

31397079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2895.

The product of its (nonzero) digits is 35721, while the sum is 39.

The square root of 31397079 is about 5603.3096469854. The cubic root of 31397079 is about 315.4736437188.

The spelling of 31397079 in words is "thirty-one million, three hundred ninety-seven thousand, seventy-nine".