31431403739 has 2 divisors, whose sum is σ = 31431403740. Its totient is φ = 31431403738.

The previous prime is 31431403727. The next prime is 31431403769. The reversal of 31431403739 is 93730413413.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31431403739 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31431403769) 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, 15715701869 + 15715701870.

It is an arithmetic number, because the mean of its divisors is an integer number (15715701870).

Almost surely, 2^31431403739 is an apocalyptic number.

31431403739 is a deficient number, since it is larger than the sum of its proper divisors (1).

31431403739 is an equidigital number, since it uses as much as digits as its factorization.

31431403739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 38.

The spelling of 31431403739 in words is "thirty-one billion, four hundred thirty-one million, four hundred three thousand, seven hundred thirty-nine".