31962981 has 4 divisors (see below), whose sum is σ = 42617312. Its totient is φ = 21308652.

The previous prime is 31962949. The next prime is 31962991. The reversal of 31962981 is 18926913.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18926913 = 3 ⋅6308971.

It is not a de Polignac number, because 31962981 - 2⁵ = 31962949 is a prime.

It is a super-2 number, since 2×31962981² = 2043264308812722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31962991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5327161 + ... + 5327166.

It is an arithmetic number, because the mean of its divisors is an integer number (10654328).

Almost surely, 2^31962981 is an apocalyptic number.

It is an amenable number.

31962981 is a deficient number, since it is larger than the sum of its proper divisors (10654331).

31962981 is a wasteful number, since it uses less digits than its factorization.

31962981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10654330.

The product of its digits is 23328, while the sum is 39.

The square root of 31962981 is about 5653.5812543909. The cubic root of 31962981 is about 317.3577381554.

The spelling of 31962981 in words is "thirty-one million, nine hundred sixty-two thousand, nine hundred eighty-one".