97538160721 has 3 divisors (see below), whose sum is σ = 97538473033. Its totient is φ = 97537848410.

The previous prime is 97538160683. The next prime is 97538160763. The reversal of 97538160721 is 12706183579.

It is a happy number.

The square root of 97538160721 is 312311.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 97538160721 - 2²³ = 97529772113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97538170721) 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 in 2 ways as a sum of consecutive naturals, for example, 156156 + ... + 468466.

Almost surely, 2^97538160721 is an apocalyptic number.

97538160721 is the 312311-st square number.

97538160721 is the 156156-th centered octagonal number.

It is an amenable number.

97538160721 is a deficient number, since it is larger than the sum of its proper divisors (312312).

97538160721 is an frugal number, since it uses more digits than its factorization.

97538160721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624622 (or 312311 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 49.

Multiplying 97538160721 by its sum of digits (49), we get a square (4779369875329 = 2186177²).

The spelling of 97538160721 in words is "ninety-seven billion, five hundred thirty-eight million, one hundred sixty thousand, seven hundred twenty-one".