97979621 has 2 divisors, whose sum is σ = 97979622. Its totient is φ = 97979620.

The previous prime is 97979593. The next prime is 97979633. The reversal of 97979621 is 12697979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55338721 + 42640900 = 7439^2 + 6530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97979621 is a prime.

It is a super-2 number, since 2×97979621² = 19200012262607282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 97979621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97979681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48989810 + 48989811.

It is an arithmetic number, because the mean of its divisors is an integer number (48989811).

Almost surely, 2^97979621 is an apocalyptic number.

It is an amenable number.

97979621 is a deficient number, since it is larger than the sum of its proper divisors (1).

97979621 is an equidigital number, since it uses as much as digits as its factorization.

97979621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 428652, while the sum is 50.

The square root of 97979621 is about 9898.4655881606. The cubic root of 97979621 is about 461.0116691396.

The spelling of 97979621 in words is "ninety-seven million, nine hundred seventy-nine thousand, six hundred twenty-one".