31540101521 has 2 divisors, whose sum is σ = 31540101522. Its totient is φ = 31540101520.

The previous prime is 31540101497. The next prime is 31540101539. The reversal of 31540101521 is 12510104513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29985770896 + 1554330625 = 173164^2 + 39425^2 .

It is a cyclic number.

It is not a de Polignac number, because 31540101521 - 2¹⁰ = 31540100497 is a prime.

It is not a weakly prime, because it can be changed into another prime (31540101121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15770050760 + 15770050761.

It is an arithmetic number, because the mean of its divisors is an integer number (15770050761).

Almost surely, 2^31540101521 is an apocalyptic number.

It is an amenable number.

31540101521 is a deficient number, since it is larger than the sum of its proper divisors (1).

31540101521 is an equidigital number, since it uses as much as digits as its factorization.

31540101521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 23.

The spelling of 31540101521 in words is "thirty-one billion, five hundred forty million, one hundred one thousand, five hundred twenty-one".