31542201517 has 2 divisors, whose sum is σ = 31542201518. Its totient is φ = 31542201516.

The previous prime is 31542201497. The next prime is 31542201529. The reversal of 31542201517 is 71510224513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30924629316 + 617572201 = 175854^2 + 24851^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31542201517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31542204517) 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, 15771100758 + 15771100759.

It is an arithmetic number, because the mean of its divisors is an integer number (15771100759).

Almost surely, 2^31542201517 is an apocalyptic number.

It is an amenable number.

31542201517 is a deficient number, since it is larger than the sum of its proper divisors (1).

31542201517 is an equidigital number, since it uses as much as digits as its factorization.

31542201517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 31.

The spelling of 31542201517 in words is "thirty-one billion, five hundred forty-two million, two hundred one thousand, five hundred seventeen".