31690137 has 8 divisors (see below), whose sum is σ = 42353280. Its totient is φ = 21076880.

The previous prime is 31690133. The next prime is 31690151. The reversal of 31690137 is 73109613.

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 31690137 - 2² = 31690133 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31690133) 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, 10962 + ... + 13547.

It is an arithmetic number, because the mean of its divisors is an integer number (5294160).

Almost surely, 2^31690137 is an apocalyptic number.

It is an amenable number.

31690137 is a deficient number, since it is larger than the sum of its proper divisors (10663143).

31690137 is a wasteful number, since it uses less digits than its factorization.

31690137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24943.

The product of its (nonzero) digits is 3402, while the sum is 30.

The square root of 31690137 is about 5629.3993462891. The cubic root of 31690137 is about 316.4521414375.

The spelling of 31690137 in words is "thirty-one million, six hundred ninety thousand, one hundred thirty-seven".