31397144 has 16 divisors (see below), whose sum is σ = 60306120. Its totient is φ = 15315520.

The previous prime is 31397143. The next prime is 31397159. The reversal of 31397144 is 44179313.

It is a self number, because there is not a number n which added to its sum of digits gives 31397144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31397143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47534 + ... + 48189.

Almost surely, 2^31397144 is an apocalyptic number.

It is an amenable number.

31397144 is a deficient number, since it is larger than the sum of its proper divisors (28908976).

31397144 is a wasteful number, since it uses less digits than its factorization.

31397144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95770 (or 95766 counting only the distinct ones).

The product of its digits is 9072, while the sum is 32.

The square root of 31397144 is about 5603.3154471259. The cubic root of 31397144 is about 315.4738614224.

The spelling of 31397144 in words is "thirty-one million, three hundred ninety-seven thousand, one hundred forty-four".