31871051 has 2 divisors, whose sum is σ = 31871052. Its totient is φ = 31871050.

The previous prime is 31871017. The next prime is 31871053. The reversal of 31871051 is 15017813.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31871051 is a prime.

Together with 31871053, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31871051.

It is not a weakly prime, because it can be changed into another prime (31871053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15935525 + 15935526.

It is an arithmetic number, because the mean of its divisors is an integer number (15935526).

Almost surely, 2^31871051 is an apocalyptic number.

31871051 is a deficient number, since it is larger than the sum of its proper divisors (1).

31871051 is an equidigital number, since it uses as much as digits as its factorization.

31871051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 31871051 is about 5645.4451551671. The cubic root of 31871051 is about 317.0531909271.

Adding to 31871051 its reverse (15017813), we get a palindrome (46888864).

The spelling of 31871051 in words is "thirty-one million, eight hundred seventy-one thousand, fifty-one".