31440165091 has 2 divisors, whose sum is σ = 31440165092. Its totient is φ = 31440165090.

The previous prime is 31440165079. The next prime is 31440165137. The reversal of 31440165091 is 19056104413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31440165091 - 2⁹ = 31440164579 is a prime.

It is not a weakly prime, because it can be changed into another prime (31440163091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15720082545 + 15720082546.

It is an arithmetic number, because the mean of its divisors is an integer number (15720082546).

Almost surely, 2^31440165091 is an apocalyptic number.

31440165091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31440165091 is an equidigital number, since it uses as much as digits as its factorization.

31440165091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

The spelling of 31440165091 in words is "thirty-one billion, four hundred forty million, one hundred sixty-five thousand, ninety-one".