31464750745721 has 2 divisors, whose sum is σ = 31464750745722. Its totient is φ = 31464750745720.

The previous prime is 31464750745679. The next prime is 31464750745733. The reversal of 31464750745721 is 12754705746413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31431597619321 + 33153126400 = 5606389^2 + 182080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31464750745721 is a prime.

It is a super-3 number, since 3×31464750745721³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (31464750745741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15732375372860 + 15732375372861.

It is an arithmetic number, because the mean of its divisors is an integer number (15732375372861).

Almost surely, 2^{31464750745721} is an apocalyptic number.

It is an amenable number.

31464750745721 is a deficient number, since it is larger than the sum of its proper divisors (1).

31464750745721 is an equidigital number, since it uses as much as digits as its factorization.

31464750745721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19756800, while the sum is 56.

The spelling of 31464750745721 in words is "thirty-one trillion, four hundred sixty-four billion, seven hundred fifty million, seven hundred forty-five thousand, seven hundred twenty-one".