31697691 has 8 divisors (see below), whose sum is σ = 42980160. Its totient is φ = 20773512.

The previous prime is 31697683. The next prime is 31697711. The reversal of 31697691 is 19679613.

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

It is not a de Polignac number, because 31697691 - 2³ = 31697683 is a prime.

It is a super-2 number, since 2×31697691² = 2009487229462962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31697651) 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, 89365 + ... + 89718.

It is an arithmetic number, because the mean of its divisors is an integer number (5372520).

Almost surely, 2^31697691 is an apocalyptic number.

31697691 is a deficient number, since it is larger than the sum of its proper divisors (11282469).

31697691 is a wasteful number, since it uses less digits than its factorization.

31697691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179145.

The product of its digits is 61236, while the sum is 42.

The square root of 31697691 is about 5630.0702482296. The cubic root of 31697691 is about 316.4772837456.

The spelling of 31697691 in words is "thirty-one million, six hundred ninety-seven thousand, six hundred ninety-one".