31513500061 has 2 divisors, whose sum is σ = 31513500062. Its totient is φ = 31513500060.

The previous prime is 31513500037. The next prime is 31513500079. The reversal of 31513500061 is 16000531513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28066635961 + 3446864100 = 167531^2 + 58710^2 .

It is a cyclic number.

It is not a de Polignac number, because 31513500061 - 2¹¹ = 31513498013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31513499999 and 31513500035.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31513800061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15756750030 + 15756750031.

It is an arithmetic number, because the mean of its divisors is an integer number (15756750031).

Almost surely, 2^31513500061 is an apocalyptic number.

It is an amenable number.

31513500061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31513500061 is an equidigital number, since it uses as much as digits as its factorization.

31513500061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 25.

The spelling of 31513500061 in words is "thirty-one billion, five hundred thirteen million, five hundred thousand, sixty-one".