31997679 has 16 divisors (see below), whose sum is σ = 48875520. Its totient is φ = 18240480.

The previous prime is 31997627. The next prime is 31997683. The reversal of 31997679 is 97679913.

It is not a de Polignac number, because 31997679 - 2⁷ = 31997551 is a prime.

It is a super-2 number, since 2×31997679² = 2047702922774082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31993679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8469 + ... + 11649.

It is an arithmetic number, because the mean of its divisors is an integer number (3054720).

Almost surely, 2^31997679 is an apocalyptic number.

31997679 is a deficient number, since it is larger than the sum of its proper divisors (16877841).

31997679 is a wasteful number, since it uses less digits than its factorization.

31997679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670.

The product of its digits is 642978, while the sum is 51.

The square root of 31997679 is about 5656.6490964174. The cubic root of 31997679 is about 317.4725344626.

It can be divided in two parts, 3199 and 7679, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 31997679 in words is "thirty-one million, nine hundred ninety-seven thousand, six hundred seventy-nine".