97975729 has 2 divisors, whose sum is σ = 97975730. Its totient is φ = 97975728.

The previous prime is 97975651. The next prime is 97975733. The reversal of 97975729 is 92757979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74356129 + 23619600 = 8623^2 + 4860^2 .

It is a cyclic number.

It is not a de Polignac number, because 97975729 - 2¹³ = 97967537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97975729.

It is not a weakly prime, because it can be changed into another prime (97975789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48987864 + 48987865.

It is an arithmetic number, because the mean of its divisors is an integer number (48987865).

Almost surely, 2^97975729 is an apocalyptic number.

It is an amenable number.

97975729 is a deficient number, since it is larger than the sum of its proper divisors (1).

97975729 is an equidigital number, since it uses as much as digits as its factorization.

97975729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2500470, while the sum is 55.

The square root of 97975729 is about 9898.2689900810. The cubic root of 97975729 is about 461.0055648731.

The spelling of 97975729 in words is "ninety-seven million, nine hundred seventy-five thousand, seven hundred twenty-nine".