99957145 has 4 divisors (see below), whose sum is σ = 119948580. Its totient is φ = 79965712.

The previous prime is 99957073. The next prime is 99957173. The reversal of 99957145 is 54175999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54175999 = 67 ⋅808597.

It can be written as a sum of positive squares in 2 ways, for example, as 24840256 + 75116889 = 4984^2 + 8667^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99957145 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9995710 + ... + 9995719.

It is an arithmetic number, because the mean of its divisors is an integer number (29987145).

Almost surely, 2^99957145 is an apocalyptic number.

It is an amenable number.

99957145 is a deficient number, since it is larger than the sum of its proper divisors (19991435).

99957145 is a wasteful number, since it uses less digits than its factorization.

99957145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19991434.

The product of its digits is 510300, while the sum is 49.

The square root of 99957145 is about 9997.8570203819. The cubic root of 99957145 is about 464.0925687909.

The spelling of 99957145 in words is "ninety-nine million, nine hundred fifty-seven thousand, one hundred forty-five".