97218757 has 2 divisors, whose sum is σ = 97218758. Its totient is φ = 97218756.

The previous prime is 97218691. The next prime is 97218773. The reversal of 97218757 is 75781279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58890276 + 38328481 = 7674^2 + 6191^2 .

It is a cyclic number.

It is not a de Polignac number, because 97218757 - 2⁷ = 97218629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97218787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48609378 + 48609379.

It is an arithmetic number, because the mean of its divisors is an integer number (48609379).

Almost surely, 2^97218757 is an apocalyptic number.

It is an amenable number.

97218757 is a deficient number, since it is larger than the sum of its proper divisors (1).

97218757 is an equidigital number, since it uses as much as digits as its factorization.

97218757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246960, while the sum is 46.

The square root of 97218757 is about 9859.9572514286. The cubic root of 97218757 is about 459.8152329784.

The spelling of 97218757 in words is "ninety-seven million, two hundred eighteen thousand, seven hundred fifty-seven".