31572949 has 2 divisors, whose sum is σ = 31572950. Its totient is φ = 31572948.

The previous prime is 31572943. The next prime is 31572971. The reversal of 31572949 is 94927513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31561924 + 11025 = 5618^2 + 105^2 .

It is an emirp because it is prime and its reverse (94927513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31572949 - 2³ = 31572941 is a prime.

It is a super-2 number, since 2×31572949² = 1993702217113202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31572941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15786474 + 15786475.

It is an arithmetic number, because the mean of its divisors is an integer number (15786475).

Almost surely, 2^31572949 is an apocalyptic number.

It is an amenable number.

31572949 is a deficient number, since it is larger than the sum of its proper divisors (1).

31572949 is an equidigital number, since it uses as much as digits as its factorization.

31572949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 31572949 is about 5618.9811354017. The cubic root of 31572949 is about 316.0615866984.

The spelling of 31572949 in words is "thirty-one million, five hundred seventy-two thousand, nine hundred forty-nine".