31461356137 has 2 divisors, whose sum is σ = 31461356138. Its totient is φ = 31461356136.

The previous prime is 31461356123. The next prime is 31461356149. The reversal of 31461356137 is 73165316413.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24306057216 + 7155298921 = 155904^2 + 84589^2 .

It is a cyclic number.

It is not a de Polignac number, because 31461356137 - 2¹⁹ = 31460831849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31461356137.

It is not a weakly prime, because it can be changed into another prime (31461356177) 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, 15730678068 + 15730678069.

It is an arithmetic number, because the mean of its divisors is an integer number (15730678069).

Almost surely, 2^31461356137 is an apocalyptic number.

It is an amenable number.

31461356137 is a deficient number, since it is larger than the sum of its proper divisors (1).

31461356137 is an equidigital number, since it uses as much as digits as its factorization.

31461356137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 40.

The spelling of 31461356137 in words is "thirty-one billion, four hundred sixty-one million, three hundred fifty-six thousand, one hundred thirty-seven".