97730257 has 2 divisors, whose sum is σ = 97730258. Its totient is φ = 97730256.

The previous prime is 97730221. The next prime is 97730267. The reversal of 97730257 is 75203779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79548561 + 18181696 = 8919^2 + 4264^2 .

It is a cyclic number.

It is not a de Polignac number, because 97730257 - 2²³ = 89341649 is a prime.

It is not a weakly prime, because it can be changed into another prime (97730267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48865128 + 48865129.

It is an arithmetic number, because the mean of its divisors is an integer number (48865129).

Almost surely, 2^97730257 is an apocalyptic number.

It is an amenable number.

97730257 is a deficient number, since it is larger than the sum of its proper divisors (1).

97730257 is an equidigital number, since it uses as much as digits as its factorization.

97730257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92610, while the sum is 40.

The square root of 97730257 is about 9885.8614697961. The cubic root of 97730257 is about 460.6202361142.

The spelling of 97730257 in words is "ninety-seven million, seven hundred thirty thousand, two hundred fifty-seven".