31163594069561 has 2 divisors, whose sum is σ = 31163594069562. Its totient is φ = 31163594069560.

The previous prime is 31163594069473. The next prime is 31163594069567. The reversal of 31163594069561 is 16596049536113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28801898227600 + 2361695841961 = 5366740^2 + 1536781^2 .

It is an emirp because it is prime and its reverse (16596049536113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31163594069561 - 2³⁰ = 31162520327737 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31163594069561.

It is not a weakly prime, because it can be changed into another prime (31163594069567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15581797034780 + 15581797034781.

It is an arithmetic number, because the mean of its divisors is an integer number (15581797034781).

Almost surely, 2^{31163594069561} is an apocalyptic number.

It is an amenable number.

31163594069561 is a deficient number, since it is larger than the sum of its proper divisors (1).

31163594069561 is an equidigital number, since it uses as much as digits as its factorization.

31163594069561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15746400, while the sum is 59.

The spelling of 31163594069561 in words is "thirty-one trillion, one hundred sixty-three billion, five hundred ninety-four million, sixty-nine thousand, five hundred sixty-one".