31242152 has 16 divisors (see below), whose sum is σ = 59572800. Its totient is φ = 15356080.

The previous prime is 31242149. The next prime is 31242157. The reversal of 31242152 is 25124213.

It is a super-2 number, since 2×31242152² = 1952144123182208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31242157) 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, 32624 + ... + 33567.

It is an arithmetic number, because the mean of its divisors is an integer number (3723300).

Almost surely, 2^31242152 is an apocalyptic number.

It is an amenable number.

31242152 is a deficient number, since it is larger than the sum of its proper divisors (28330648).

31242152 is a wasteful number, since it uses less digits than its factorization.

31242152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66256 (or 66252 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 31242152 is about 5589.4679532134. The cubic root of 31242152 is about 314.9538926384.

Adding to 31242152 its reverse (25124213), we get a palindrome (56366365).

The spelling of 31242152 in words is "thirty-one million, two hundred forty-two thousand, one hundred fifty-two".