31361971 has 2 divisors, whose sum is σ = 31361972. Its totient is φ = 31361970.

The previous prime is 31361969. The next prime is 31362011. The reversal of 31361971 is 17916313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31361971 - 2¹ = 31361969 is a prime.

Together with 31361969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31361171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15680985 + 15680986.

It is an arithmetic number, because the mean of its divisors is an integer number (15680986).

Almost surely, 2^31361971 is an apocalyptic number.

31361971 is a deficient number, since it is larger than the sum of its proper divisors (1).

31361971 is an equidigital number, since it uses as much as digits as its factorization.

31361971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 31.

The square root of 31361971 is about 5600.1759793778. The cubic root of 31361971 is about 315.3560130363.

The spelling of 31361971 in words is "thirty-one million, three hundred sixty-one thousand, nine hundred seventy-one".