97197791 has 2 divisors, whose sum is σ = 97197792. Its totient is φ = 97197790.

The previous prime is 97197781. The next prime is 97197797. The reversal of 97197791 is 19779179.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97197791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97197797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48598895 + 48598896.

It is an arithmetic number, because the mean of its divisors is an integer number (48598896).

Almost surely, 2^97197791 is an apocalyptic number.

97197791 is a deficient number, since it is larger than the sum of its proper divisors (1).

97197791 is an equidigital number, since it uses as much as digits as its factorization.

97197791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 250047, while the sum is 50.

The square root of 97197791 is about 9858.8940049074. The cubic root of 97197791 is about 459.7821763284.

The spelling of 97197791 in words is "ninety-seven million, one hundred ninety-seven thousand, seven hundred ninety-one".