31400406091 has 2 divisors, whose sum is σ = 31400406092. Its totient is φ = 31400406090.

The previous prime is 31400406061. The next prime is 31400406097. The reversal of 31400406091 is 19060400413.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31400406091 - 2²⁷ = 31266188363 is a prime.

It is not a weakly prime, because it can be changed into another prime (31400406097) 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, 15700203045 + 15700203046.

It is an arithmetic number, because the mean of its divisors is an integer number (15700203046).

Almost surely, 2^31400406091 is an apocalyptic number.

31400406091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31400406091 is an equidigital number, since it uses as much as digits as its factorization.

31400406091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 31400406091 in words is "thirty-one billion, four hundred million, four hundred six thousand, ninety-one".