31181909051 has 2 divisors, whose sum is σ = 31181909052. Its totient is φ = 31181909050.

The previous prime is 31181909041. The next prime is 31181909053. The reversal of 31181909051 is 15090918113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31181909051 - 2⁶ = 31181908987 is a prime.

It is a super-2 number, since 2×31181909051² (a number of 22 digits) contains 22 as substring.

Together with 31181909053, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31181908996 and 31181909014.

It is not a weakly prime, because it can be changed into another prime (31181909053) 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 as a sum of consecutive naturals, namely, 15590954525 + 15590954526.

It is an arithmetic number, because the mean of its divisors is an integer number (15590954526).

Almost surely, 2^31181909051 is an apocalyptic number.

31181909051 is a deficient number, since it is larger than the sum of its proper divisors (1).

31181909051 is an equidigital number, since it uses as much as digits as its factorization.

31181909051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 38.

The spelling of 31181909051 in words is "thirty-one billion, one hundred eighty-one million, nine hundred nine thousand, fifty-one".