97811797 has 2 divisors, whose sum is σ = 97811798. Its totient is φ = 97811796.

The previous prime is 97811737. The next prime is 97811807. The reversal of 97811797 is 79711879.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97594641 + 217156 = 9879^2 + 466^2 .

It is a cyclic number.

It is not a de Polignac number, because 97811797 - 2¹⁵ = 97779029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97811797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97811737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48905898 + 48905899.

It is an arithmetic number, because the mean of its divisors is an integer number (48905899).

Almost surely, 2^97811797 is an apocalyptic number.

It is an amenable number.

97811797 is a deficient number, since it is larger than the sum of its proper divisors (1).

97811797 is an equidigital number, since it uses as much as digits as its factorization.

97811797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222264, while the sum is 49.

The square root of 97811797 is about 9889.9846814846. The cubic root of 97811797 is about 460.7483047200.

The spelling of 97811797 in words is "ninety-seven million, eight hundred eleven thousand, seven hundred ninety-seven".