97501401721 has 2 divisors, whose sum is σ = 97501401722. Its totient is φ = 97501401720.

The previous prime is 97501401653. The next prime is 97501401727. The reversal of 97501401721 is 12710410579.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65464339600 + 32037062121 = 255860^2 + 178989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97501401721 is a prime.

It is not a weakly prime, because it can be changed into another prime (97501401727) 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 as a sum of consecutive naturals, namely, 48750700860 + 48750700861.

It is an arithmetic number, because the mean of its divisors is an integer number (48750700861).

Almost surely, 2^97501401721 is an apocalyptic number.

It is an amenable number.

97501401721 is a deficient number, since it is larger than the sum of its proper divisors (1).

97501401721 is an equidigital number, since it uses as much as digits as its factorization.

97501401721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 37.

The spelling of 97501401721 in words is "ninety-seven billion, five hundred one million, four hundred one thousand, seven hundred twenty-one".