99897133 has 6 divisors (see below), whose sum is σ = 116206926. Its totient is φ = 85626072.

The previous prime is 99897121. The next prime is 99897139. The reversal of 99897133 is 33179899.

It can be written as a sum of positive squares in only one way, i.e., 95218564 + 4678569 = 9758^2 + 2163^2 .

It is a de Polignac number, because none of the positive numbers 2^k-99897133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 2038717 = 99897133 / (9 + 9 + 8 + 9 + 7 + 1 + 3 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99897139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1019310 + ... + 1019407.

It is an arithmetic number, because the mean of its divisors is an integer number (19367821).

Almost surely, 2^99897133 is an apocalyptic number.

It is an amenable number.

99897133 is a deficient number, since it is larger than the sum of its proper divisors (16309793).

99897133 is a wasteful number, since it uses less digits than its factorization.

99897133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2038731 (or 2038724 counting only the distinct ones).

The product of its digits is 367416, while the sum is 49.

The square root of 99897133 is about 9994.8553266168. The cubic root of 99897133 is about 463.9996733177. Note that the first 3 decimals are identical.

The spelling of 99897133 in words is "ninety-nine million, eight hundred ninety-seven thousand, one hundred thirty-three".