97757921 has 2 divisors, whose sum is σ = 97757922. Its totient is φ = 97757920.

The previous prime is 97757893. The next prime is 97757951. The reversal of 97757921 is 12975779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62236321 + 35521600 = 7889^2 + 5960^2 .

It is an emirp because it is prime and its reverse (12975779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97757921 - 2²⁶ = 30649057 is a prime.

It is a super-2 number, since 2×97757921² = 19113222236484482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (97757951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48878960 + 48878961.

It is an arithmetic number, because the mean of its divisors is an integer number (48878961).

Almost surely, 2^97757921 is an apocalyptic number.

It is an amenable number.

97757921 is a deficient number, since it is larger than the sum of its proper divisors (1).

97757921 is an equidigital number, since it uses as much as digits as its factorization.

97757921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 277830, while the sum is 47.

The square root of 97757921 is about 9887.2605407160. The cubic root of 97757921 is about 460.6636938125.

The spelling of 97757921 in words is "ninety-seven million, seven hundred fifty-seven thousand, nine hundred twenty-one".