31690245 has 8 divisors (see below), whose sum is σ = 50704416. Its totient is φ = 16901456.

The previous prime is 31690231. The next prime is 31690259. The reversal of 31690245 is 54209613.

It is an interprime number because it is at equal distance from previous prime (31690231) and next prime (31690259).

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 31690245 - 2⁴ = 31690229 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1056327 + ... + 1056356.

It is an arithmetic number, because the mean of its divisors is an integer number (6338052).

Almost surely, 2^31690245 is an apocalyptic number.

It is an amenable number.

31690245 is a deficient number, since it is larger than the sum of its proper divisors (19014171).

31690245 is a wasteful number, since it uses less digits than its factorization.

31690245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112691.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 31690245 is about 5629.4089387786. The cubic root of 31690245 is about 316.4525009268.

Adding to 31690245 its reverse (54209613), we get a palindrome (85899858).

The spelling of 31690245 in words is "thirty-one million, six hundred ninety thousand, two hundred forty-five".