31715725541 has 2 divisors, whose sum is σ = 31715725542. Its totient is φ = 31715725540.

The previous prime is 31715725511. The next prime is 31715725553. The reversal of 31715725541 is 14552751713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26072560900 + 5643164641 = 161470^2 + 75121^2 .

It is a cyclic number.

It is not a de Polignac number, because 31715725541 - 2⁶ = 31715725477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31715725511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15857862770 + 15857862771.

It is an arithmetic number, because the mean of its divisors is an integer number (15857862771).

Almost surely, 2^31715725541 is an apocalyptic number.

It is an amenable number.

31715725541 is a deficient number, since it is larger than the sum of its proper divisors (1).

31715725541 is an equidigital number, since it uses as much as digits as its factorization.

31715725541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147000, while the sum is 41.

The spelling of 31715725541 in words is "thirty-one billion, seven hundred fifteen million, seven hundred twenty-five thousand, five hundred forty-one".