97919621 has 2 divisors, whose sum is σ = 97919622. Its totient is φ = 97919620.

The previous prime is 97919599. The next prime is 97919641. The reversal of 97919621 is 12691979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53217025 + 44702596 = 7295^2 + 6686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97919621 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 (97919641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48959810 + 48959811.

It is an arithmetic number, because the mean of its divisors is an integer number (48959811).

Almost surely, 2^97919621 is an apocalyptic number.

It is an amenable number.

97919621 is a deficient number, since it is larger than the sum of its proper divisors (1).

97919621 is an equidigital number, since it uses as much as digits as its factorization.

97919621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 44.

The square root of 97919621 is about 9895.4343512551. The cubic root of 97919621 is about 460.9175463414.

The spelling of 97919621 in words is "ninety-seven million, nine hundred nineteen thousand, six hundred twenty-one".