97128791 has 2 divisors, whose sum is σ = 97128792. Its totient is φ = 97128790.

The previous prime is 97128767. The next prime is 97128821. The reversal of 97128791 is 19782179.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97128791 - 2⁶ = 97128727 is a prime.

It is a super-2 number, since 2×97128791² = 18868004082243362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97128391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48564395 + 48564396.

It is an arithmetic number, because the mean of its divisors is an integer number (48564396).

Almost surely, 2^97128791 is an apocalyptic number.

97128791 is a deficient number, since it is larger than the sum of its proper divisors (1).

97128791 is an equidigital number, since it uses as much as digits as its factorization.

97128791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 44.

The square root of 97128791 is about 9855.3940053151. The cubic root of 97128791 is about 459.6733519065.

The spelling of 97128791 in words is "ninety-seven million, one hundred twenty-eight thousand, seven hundred ninety-one".