31697071 has 6 divisors (see below), whose sum is σ = 36872160. Its totient is φ = 27168876.

The previous prime is 31697069. The next prime is 31697089. The reversal of 31697071 is 17079613.

It is a happy number.

It is not a de Polignac number, because 31697071 - 2¹ = 31697069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31697371) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 323391 + ... + 323488.

It is an arithmetic number, because the mean of its divisors is an integer number (6145360).

Almost surely, 2^31697071 is an apocalyptic number.

31697071 is a deficient number, since it is larger than the sum of its proper divisors (5175089).

31697071 is an equidigital number, since it uses as much as digits as its factorization.

31697071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646893 (or 646886 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 31697071 is about 5630.0151864804. The cubic root of 31697071 is about 316.4752203230.

The spelling of 31697071 in words is "thirty-one million, six hundred ninety-seven thousand, seventy-one".