97305721 has 4 divisors (see below), whose sum is σ = 99141732. Its totient is φ = 95469712.

The previous prime is 97305697. The next prime is 97305727. The reversal of 97305721 is 12750379.

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 70896400 + 26409321 = 8420^2 + 5139^2 .

It is a cyclic number.

It is not a de Polignac number, because 97305721 - 2¹⁵ = 97272953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97305727) 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, 917926 + ... + 918031.

It is an arithmetic number, because the mean of its divisors is an integer number (24785433).

Almost surely, 2^97305721 is an apocalyptic number.

It is an amenable number.

97305721 is a deficient number, since it is larger than the sum of its proper divisors (1836011).

97305721 is a wasteful number, since it uses less digits than its factorization.

97305721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836010.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 97305721 is about 9864.3662239396. The cubic root of 97305721 is about 459.9522965655.

It can be divided in two parts, 9730 and 5721, that added together give a palindrome (15451).

The spelling of 97305721 in words is "ninety-seven million, three hundred five thousand, seven hundred twenty-one".