97591421 has 2 divisors, whose sum is σ = 97591422. Its totient is φ = 97591420.

The previous prime is 97591397. The next prime is 97591427. The reversal of 97591421 is 12419579.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84732025 + 12859396 = 9205^2 + 3586^2 .

It is a cyclic number.

It is not a de Polignac number, because 97591421 - 2¹⁰ = 97590397 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97591427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48795710 + 48795711.

It is an arithmetic number, because the mean of its divisors is an integer number (48795711).

Almost surely, 2^97591421 is an apocalyptic number.

It is an amenable number.

97591421 is a deficient number, since it is larger than the sum of its proper divisors (1).

97591421 is an equidigital number, since it uses as much as digits as its factorization.

97591421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 38.

The square root of 97591421 is about 9878.8370266950. The cubic root of 97591421 is about 460.4020130860.

The spelling of 97591421 in words is "ninety-seven million, five hundred ninety-one thousand, four hundred twenty-one".