99725189 has 4 divisors (see below), whose sum is σ = 99750156. Its totient is φ = 99700224.

The previous prime is 99725173. The next prime is 99725201. The reversal of 99725189 is 98152799.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36204289 + 63520900 = 6017^2 + 7970^2 .

It is not a de Polignac number, because 99725189 - 2⁴ = 99725173 is a prime.

It is a super-2 number, since 2×99725189² = 19890226642171442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99725159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4994 + ... + 14979.

It is an arithmetic number, because the mean of its divisors is an integer number (24937539).

Almost surely, 2^99725189 is an apocalyptic number.

It is an amenable number.

99725189 is a deficient number, since it is larger than the sum of its proper divisors (24967).

99725189 is a wasteful number, since it uses less digits than its factorization.

99725189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24966.

The product of its digits is 408240, while the sum is 50.

The square root of 99725189 is about 9986.2499968707. The cubic root of 99725189 is about 463.7333067228.

The spelling of 99725189 in words is "ninety-nine million, seven hundred twenty-five thousand, one hundred eighty-nine".