97722857 has 2 divisors, whose sum is σ = 97722858. Its totient is φ = 97722856.

The previous prime is 97722847. The next prime is 97722893. The reversal of 97722857 is 75822779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76230361 + 21492496 = 8731^2 + 4636^2 .

It is an emirp because it is prime and its reverse (75822779) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97722857 - 2⁴ = 97722841 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97722847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48861428 + 48861429.

It is an arithmetic number, because the mean of its divisors is an integer number (48861429).

Almost surely, 2^97722857 is an apocalyptic number.

It is an amenable number.

97722857 is a deficient number, since it is larger than the sum of its proper divisors (1).

97722857 is an equidigital number, since it uses as much as digits as its factorization.

97722857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493920, while the sum is 47.

The square root of 97722857 is about 9885.4871908268. The cubic root of 97722857 is about 460.6086099782.

The spelling of 97722857 in words is "ninety-seven million, seven hundred twenty-two thousand, eight hundred fifty-seven".