99257691 has 64 divisors (see below), whose sum is σ = 161280000. Its totient is φ = 53706240.

The previous prime is 99257681. The next prime is 99257759. The reversal of 99257691 is 19675299.

It is not a de Polignac number, because 99257691 - 2⁷ = 99257563 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99257691.

It is not an unprimeable number, because it can be changed into a prime (99257671) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 666085 + ... + 666233.

It is an arithmetic number, because the mean of its divisors is an integer number (2520000).

Almost surely, 2^99257691 is an apocalyptic number.

99257691 is a deficient number, since it is larger than the sum of its proper divisors (62022309).

99257691 is a wasteful number, since it uses less digits than its factorization.

99257691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244.

The product of its digits is 306180, while the sum is 48.

The square root of 99257691 is about 9962.8154153332. The cubic root of 99257691 is about 463.0075320611.

The spelling of 99257691 in words is "ninety-nine million, two hundred fifty-seven thousand, six hundred ninety-one".