31542048521 has 2 divisors, whose sum is σ = 31542048522. Its totient is φ = 31542048520.

The previous prime is 31542048511. The next prime is 31542048541. The reversal of 31542048521 is 12584024513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24975377296 + 6566671225 = 158036^2 + 81035^2 .

It is a cyclic number.

It is not a de Polignac number, because 31542048521 - 2⁶ = 31542048457 is a prime.

It is a super-2 number, since 2×31542048521² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31542048511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15771024260 + 15771024261.

It is an arithmetic number, because the mean of its divisors is an integer number (15771024261).

Almost surely, 2^31542048521 is an apocalyptic number.

It is an amenable number.

31542048521 is a deficient number, since it is larger than the sum of its proper divisors (1).

31542048521 is an equidigital number, since it uses as much as digits as its factorization.

31542048521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38400, while the sum is 35.

The spelling of 31542048521 in words is "thirty-one billion, five hundred forty-two million, forty-eight thousand, five hundred twenty-one".