31542201521 has 8 divisors (see below), whose sum is σ = 32496897000. Its totient is φ = 30592885248.

The previous prime is 31542201517. The next prime is 31542201529. The reversal of 31542201521 is 12510224513.

It can be written as a sum of positive squares in 4 ways, for example, as 4229681296 + 27312520225 = 65036^2 + 165265^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31542201521 - 2² = 31542201517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31542201529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1332896 + ... + 1356353.

It is an arithmetic number, because the mean of its divisors is an integer number (4062112125).

Almost surely, 2^31542201521 is an apocalyptic number.

It is an amenable number.

31542201521 is a deficient number, since it is larger than the sum of its proper divisors (954695479).

31542201521 is a wasteful number, since it uses less digits than its factorization.

31542201521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689603.

The product of its (nonzero) digits is 2400, while the sum is 26.

The spelling of 31542201521 in words is "thirty-one billion, five hundred forty-two million, two hundred one thousand, five hundred twenty-one".