97210391 has 2 divisors, whose sum is σ = 97210392. Its totient is φ = 97210390.

The previous prime is 97210363. The next prime is 97210409. The reversal of 97210391 is 19301279.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97210391 - 2¹⁴ = 97194007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97210331) 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, 48605195 + 48605196.

It is an arithmetic number, because the mean of its divisors is an integer number (48605196).

Almost surely, 2^97210391 is an apocalyptic number.

97210391 is a deficient number, since it is larger than the sum of its proper divisors (1).

97210391 is an equidigital number, since it uses as much as digits as its factorization.

97210391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 97210391 is about 9859.5330011112. The cubic root of 97210391 is about 459.8020430526.

The spelling of 97210391 in words is "ninety-seven million, two hundred ten thousand, three hundred ninety-one".