31679971 has 2 divisors, whose sum is σ = 31679972. Its totient is φ = 31679970.

The previous prime is 31679941. The next prime is 31679981. The reversal of 31679971 is 17997613.

It is a strong prime.

It is an emirp because it is prime and its reverse (17997613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31679971 - 2⁵ = 31679939 is a prime.

It is not a weakly prime, because it can be changed into another prime (31679941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15839985 + 15839986.

It is an arithmetic number, because the mean of its divisors is an integer number (15839986).

Almost surely, 2^31679971 is an apocalyptic number.

31679971 is a deficient number, since it is larger than the sum of its proper divisors (1).

31679971 is an equidigital number, since it uses as much as digits as its factorization.

31679971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71442, while the sum is 43.

The square root of 31679971 is about 5628.4963356122. The cubic root of 31679971 is about 316.4182991884.

The spelling of 31679971 in words is "thirty-one million, six hundred seventy-nine thousand, nine hundred seventy-one".