31132319971 has 2 divisors, whose sum is σ = 31132319972. Its totient is φ = 31132319970.

The previous prime is 31132319969. The next prime is 31132320029. The reversal of 31132319971 is 17991323113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31132319971 - 2¹ = 31132319969 is a prime.

Together with 31132319969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31132319941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15566159985 + 15566159986.

It is an arithmetic number, because the mean of its divisors is an integer number (15566159986).

Almost surely, 2^31132319971 is an apocalyptic number.

31132319971 is a deficient number, since it is larger than the sum of its proper divisors (1).

31132319971 is an equidigital number, since it uses as much as digits as its factorization.

31132319971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 40.

The spelling of 31132319971 in words is "thirty-one billion, one hundred thirty-two million, three hundred nineteen thousand, nine hundred seventy-one".