97501431721 has 4 divisors (see below), whose sum is σ = 97502799744. Its totient is φ = 97500063700.

The previous prime is 97501431707. The next prime is 97501431733. The reversal of 97501431721 is 12713410579.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 97501431721 - 2¹⁷ = 97501300649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97501401721) 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, 570865 + ... + 721726.

It is an arithmetic number, because the mean of its divisors is an integer number (24375699936).

Almost surely, 2^97501431721 is an apocalyptic number.

It is an amenable number.

97501431721 is a deficient number, since it is larger than the sum of its proper divisors (1368023).

97501431721 is a wasteful number, since it uses less digits than its factorization.

97501431721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368022.

The product of its (nonzero) digits is 52920, while the sum is 40.

The spelling of 97501431721 in words is "ninety-seven billion, five hundred one million, four hundred thirty-one thousand, seven hundred twenty-one".