97217621 has 2 divisors, whose sum is σ = 97217622. Its totient is φ = 97217620.

The previous prime is 97217597. The next prime is 97217641. The reversal of 97217621 is 12671279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83631025 + 13586596 = 9145^2 + 3686^2 .

It is a cyclic number.

It is not a de Polignac number, because 97217621 - 2⁶ = 97217557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97217641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48608810 + 48608811.

It is an arithmetic number, because the mean of its divisors is an integer number (48608811).

Almost surely, 2^97217621 is an apocalyptic number.

It is an amenable number.

97217621 is a deficient number, since it is larger than the sum of its proper divisors (1).

97217621 is an equidigital number, since it uses as much as digits as its factorization.

97217621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 35.

The square root of 97217621 is about 9859.8996445197. The cubic root of 97217621 is about 459.8134419930.

The spelling of 97217621 in words is "ninety-seven million, two hundred seventeen thousand, six hundred twenty-one".