97256081521 has 4 divisors (see below), whose sum is σ = 97749767412. Its totient is φ = 96762395632.

The previous prime is 97256081519. The next prime is 97256081537. The reversal of 97256081521 is 12518065279.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 96387895296 + 868186225 = 310464^2 + 29465^2 .

It is a cyclic number.

It is not a de Polignac number, because 97256081521 - 2¹ = 97256081519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97256081621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246842650 + ... + 246843043.

It is an arithmetic number, because the mean of its divisors is an integer number (24437441853).

Almost surely, 2^97256081521 is an apocalyptic number.

It is an amenable number.

97256081521 is a deficient number, since it is larger than the sum of its proper divisors (493685891).

97256081521 is a wasteful number, since it uses less digits than its factorization.

97256081521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493685890.

The product of its (nonzero) digits is 302400, while the sum is 46.

The spelling of 97256081521 in words is "ninety-seven billion, two hundred fifty-six million, eighty-one thousand, five hundred twenty-one".