97957661 has 2 divisors, whose sum is σ = 97957662. Its totient is φ = 97957660.

The previous prime is 97957649. The next prime is 97957687. The reversal of 97957661 is 16675979.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59752900 + 38204761 = 7730^2 + 6181^2 .

It is an emirp because it is prime and its reverse (16675979) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97957661 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97957631) 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, 48978830 + 48978831.

It is an arithmetic number, because the mean of its divisors is an integer number (48978831).

Almost surely, 2^97957661 is an apocalyptic number.

It is an amenable number.

97957661 is a deficient number, since it is larger than the sum of its proper divisors (1).

97957661 is an equidigital number, since it uses as much as digits as its factorization.

97957661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 50.

The square root of 97957661 is about 9897.3562631644. The cubic root of 97957661 is about 460.9772246549.

The spelling of 97957661 in words is "ninety-seven million, nine hundred fifty-seven thousand, six hundred sixty-one".