31812152 has 8 divisors (see below), whose sum is σ = 59647800. Its totient is φ = 15906072.

The previous prime is 31812149. The next prime is 31812163. The reversal of 31812152 is 25121813.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×31812152² = 2024026029742208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1988252 + ... + 1988267.

It is an arithmetic number, because the mean of its divisors is an integer number (7455975).

Almost surely, 2^31812152 is an apocalyptic number.

It is an amenable number.

31812152 is a deficient number, since it is larger than the sum of its proper divisors (27835648).

31812152 is a wasteful number, since it uses less digits than its factorization.

31812152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3976525 (or 3976521 counting only the distinct ones).

The product of its digits is 480, while the sum is 23.

The square root of 31812152 is about 5640.2262365973. The cubic root of 31812152 is about 316.8577614214.

Adding to 31812152 its reverse (25121813), we get a palindrome (56933965).

The spelling of 31812152 in words is "thirty-one million, eight hundred twelve thousand, one hundred fifty-two".