31405156465481 has 2 divisors, whose sum is σ = 31405156465482. Its totient is φ = 31405156465480.

The previous prime is 31405156465427. The next prime is 31405156465513. The reversal of 31405156465481 is 18456465150413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21946554631225 + 9458601834256 = 4684715^2 + 3075484^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31405156465481 is a prime.

It is a super-2 number, since 2×31405156465481² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31405156465181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15702578232740 + 15702578232741.

It is an arithmetic number, because the mean of its divisors is an integer number (15702578232741).

Almost surely, 2^{31405156465481} is an apocalyptic number.

It is an amenable number.

31405156465481 is a deficient number, since it is larger than the sum of its proper divisors (1).

31405156465481 is an equidigital number, since it uses as much as digits as its factorization.

31405156465481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912000, while the sum is 53.

The spelling of 31405156465481 in words is "thirty-one trillion, four hundred five billion, one hundred fifty-six million, four hundred sixty-five thousand, four hundred eighty-one".