31970381 has 8 divisors (see below), whose sum is σ = 32336280. Its totient is φ = 31606848.

The previous prime is 31970357. The next prime is 31970399. The reversal of 31970381 is 18307913.

It can be written as a sum of positive squares in 4 ways, for example, as 217156 + 31753225 = 466^2 + 5635^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31970381 is a prime.

It is a super-2 number, since 2×31970381² = 2044210522570322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31970321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41855 + ... + 42611.

It is an arithmetic number, because the mean of its divisors is an integer number (4042035).

Almost surely, 2^31970381 is an apocalyptic number.

It is an amenable number.

31970381 is a deficient number, since it is larger than the sum of its proper divisors (365899).

31970381 is a wasteful number, since it uses less digits than its factorization.

31970381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 31970381 is about 5654.2356689477. The cubic root of 31970381 is about 317.3822275905.

The spelling of 31970381 in words is "thirty-one million, nine hundred seventy thousand, three hundred eighty-one".