97128591 has 16 divisors (see below), whose sum is σ = 148151808. Its totient is φ = 55447200.

The previous prime is 97128587. The next prime is 97128607. The reversal of 97128591 is 19582179.

It is not a de Polignac number, because 97128591 - 2² = 97128587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97128541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30201 + ... + 33261.

It is an arithmetic number, because the mean of its divisors is an integer number (9259488).

Almost surely, 2^97128591 is an apocalyptic number.

97128591 is a deficient number, since it is larger than the sum of its proper divisors (51023217).

97128591 is a wasteful number, since it uses less digits than its factorization.

97128591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4582.

The product of its digits is 45360, while the sum is 42.

The square root of 97128591 is about 9855.3838585821. The cubic root of 97128591 is about 459.6730363985.

The spelling of 97128591 in words is "ninety-seven million, one hundred twenty-eight thousand, five hundred ninety-one".