31924981 has 4 divisors (see below), whose sum is σ = 34827264. Its totient is φ = 29022700.

The previous prime is 31924979. The next prime is 31924999. The reversal of 31924981 is 18942913.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31924981 - 2¹ = 31924979 is a prime.

It is a super-2 number, since 2×31924981² = 2038408823700722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31924981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31922981) 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, 1451125 + ... + 1451146.

It is an arithmetic number, because the mean of its divisors is an integer number (8706816).

Almost surely, 2^31924981 is an apocalyptic number.

It is an amenable number.

31924981 is a deficient number, since it is larger than the sum of its proper divisors (2902283).

31924981 is a wasteful number, since it uses less digits than its factorization.

31924981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2902282.

The product of its digits is 15552, while the sum is 37.

The square root of 31924981 is about 5650.2195532563. The cubic root of 31924981 is about 317.2319220190.

The spelling of 31924981 in words is "thirty-one million, nine hundred twenty-four thousand, nine hundred eighty-one".