31997283 has 4 divisors (see below), whose sum is σ = 42663048. Its totient is φ = 21331520.

The previous prime is 31997249. The next prime is 31997299. The reversal of 31997283 is 38279913.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31997283 - 2¹² = 31993187 is a prime.

It is a super-2 number, since 2×31997283² = 2047652238764178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31997233) 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, 5332878 + ... + 5332883.

It is an arithmetic number, because the mean of its divisors is an integer number (10665762).

Almost surely, 2^31997283 is an apocalyptic number.

31997283 is a deficient number, since it is larger than the sum of its proper divisors (10665765).

31997283 is a wasteful number, since it uses less digits than its factorization.

31997283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10665764.

The product of its digits is 81648, while the sum is 42.

The square root of 31997283 is about 5656.6140932540. The cubic root of 31997283 is about 317.4712247880.

The spelling of 31997283 in words is "thirty-one million, nine hundred ninety-seven thousand, two hundred eighty-three".