31451972 has 12 divisors (see below), whose sum is σ = 58278780. Its totient is φ = 14800896.

The previous prime is 31451969. The next prime is 31451993. The reversal of 31451972 is 27915413.

It can be written as a sum of positive squares in 2 ways, for example, as 15178816 + 16273156 = 3896^2 + 4034^2 .

It is a super-3 number, since 3×31451972³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231197 + ... + 231332.

It is an arithmetic number, because the mean of its divisors is an integer number (4856565).

Almost surely, 2^31451972 is an apocalyptic number.

It is an amenable number.

31451972 is a deficient number, since it is larger than the sum of its proper divisors (26826808).

31451972 is a wasteful number, since it uses less digits than its factorization.

31451972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462550 (or 462548 counting only the distinct ones).

The product of its digits is 7560, while the sum is 32.

The square root of 31451972 is about 5608.2057736856. The cubic root of 31451972 is about 315.6573891801.

It can be divided in two parts, 31451 and 972, that added together give a palindrome (32423).

The spelling of 31451972 in words is "thirty-one million, four hundred fifty-one thousand, nine hundred seventy-two".