97766621 has 2 divisors, whose sum is σ = 97766622. Its totient is φ = 97766620.

The previous prime is 97766593. The next prime is 97766633. The reversal of 97766621 is 12666779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96314596 + 1452025 = 9814^2 + 1205^2 .

It is an emirp because it is prime and its reverse (12666779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97766621 - 2¹⁰ = 97765597 is a prime.

It is a Chen prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97766671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48883310 + 48883311.

It is an arithmetic number, because the mean of its divisors is an integer number (48883311).

Almost surely, 2^97766621 is an apocalyptic number.

It is an amenable number.

97766621 is a deficient number, since it is larger than the sum of its proper divisors (1).

97766621 is an equidigital number, since it uses as much as digits as its factorization.

97766621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 44.

The square root of 97766621 is about 9887.7004910141. The cubic root of 97766621 is about 460.6773590487.

The spelling of 97766621 in words is "ninety-seven million, seven hundred sixty-six thousand, six hundred twenty-one".