31197109511 has 2 divisors, whose sum is σ = 31197109512. Its totient is φ = 31197109510.

The previous prime is 31197109507. The next prime is 31197109519. The reversal of 31197109511 is 11590179113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31197109511 - 2² = 31197109507 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31197109519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15598554755 + 15598554756.

It is an arithmetic number, because the mean of its divisors is an integer number (15598554756).

Almost surely, 2^31197109511 is an apocalyptic number.

31197109511 is a deficient number, since it is larger than the sum of its proper divisors (1).

31197109511 is an equidigital number, since it uses as much as digits as its factorization.

31197109511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8505, while the sum is 38.

The spelling of 31197109511 in words is "thirty-one billion, one hundred ninety-seven million, one hundred nine thousand, five hundred eleven".