31385127091 has 2 divisors, whose sum is σ = 31385127092. Its totient is φ = 31385127090.

The previous prime is 31385127073. The next prime is 31385127107. The reversal of 31385127091 is 19072158313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31385127091 - 2²¹ = 31383029939 is a prime.

It is not a weakly prime, because it can be changed into another prime (31385127001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15692563545 + 15692563546.

It is an arithmetic number, because the mean of its divisors is an integer number (15692563546).

Almost surely, 2^31385127091 is an apocalyptic number.

31385127091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31385127091 is an equidigital number, since it uses as much as digits as its factorization.

31385127091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 31385127091 in words is "thirty-one billion, three hundred eighty-five million, one hundred twenty-seven thousand, ninety-one".