31690193 has 8 divisors (see below), whose sum is σ = 33798240. Its totient is φ = 29609280.

The previous prime is 31690189. The next prime is 31690199. The reversal of 31690193 is 39109613.

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

It is a cyclic number.

It is not a de Polignac number, because 31690193 - 2² = 31690189 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31690199) 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, 4343 + ... + 9068.

It is an arithmetic number, because the mean of its divisors is an integer number (4224780).

Almost surely, 2^31690193 is an apocalyptic number.

It is an amenable number.

31690193 is a deficient number, since it is larger than the sum of its proper divisors (2108047).

31690193 is a wasteful number, since it uses less digits than its factorization.

31690193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13567.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 31690193 is about 5629.4043201746. The cubic root of 31690193 is about 316.4523278394.

It can be divided in two parts, 316 and 90193, that added together give a palindrome (90509).

The spelling of 31690193 in words is "thirty-one million, six hundred ninety thousand, one hundred ninety-three".