31397061 has 4 divisors (see below), whose sum is σ = 41862752. Its totient is φ = 20931372.

The previous prime is 31397039. The next prime is 31397077. The reversal of 31397061 is 16079313.

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: 16079313 = 3 ⋅5359771.

It is not a de Polignac number, because 31397061 - 2⁵ = 31397029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31397161) 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, 5232841 + ... + 5232846.

It is an arithmetic number, because the mean of its divisors is an integer number (10465688).

Almost surely, 2^31397061 is an apocalyptic number.

It is an amenable number.

31397061 is a deficient number, since it is larger than the sum of its proper divisors (10465691).

31397061 is a wasteful number, since it uses less digits than its factorization.

31397061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10465690.

The product of its (nonzero) digits is 3402, while the sum is 30.

The square root of 31397061 is about 5603.3080407916. The cubic root of 31397061 is about 315.4735834316.

The spelling of 31397061 in words is "thirty-one million, three hundred ninety-seven thousand, sixty-one".