31506646541 has 2 divisors, whose sum is σ = 31506646542. Its totient is φ = 31506646540.

The previous prime is 31506646529. The next prime is 31506646579. The reversal of 31506646541 is 14564660513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31133190916 + 373455625 = 176446^2 + 19325^2 .

It is a cyclic number.

It is not a de Polignac number, because 31506646541 - 2¹⁴ = 31506630157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31506648541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15753323270 + 15753323271.

It is an arithmetic number, because the mean of its divisors is an integer number (15753323271).

Almost surely, 2^31506646541 is an apocalyptic number.

It is an amenable number.

31506646541 is a deficient number, since it is larger than the sum of its proper divisors (1).

31506646541 is an equidigital number, since it uses as much as digits as its factorization.

31506646541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 31506646541 in words is "thirty-one billion, five hundred six million, six hundred forty-six thousand, five hundred forty-one".