99901825 has 6 divisors (see below), whose sum is σ = 123878294. Its totient is φ = 79921440.

The previous prime is 99901807. The next prime is 99901853. The reversal of 99901825 is 52810999.

It can be written as a sum of positive squares in 3 ways, for example, as 461041 + 99440784 = 679^2 + 9972^2 .

It is not a de Polignac number, because 99901825 - 2¹⁵ = 99869057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1998012 + ... + 1998061.

Almost surely, 2^99901825 is an apocalyptic number.

It is an amenable number.

99901825 is a deficient number, since it is larger than the sum of its proper divisors (23976469).

99901825 is a wasteful number, since it uses less digits than its factorization.

99901825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3996083 (or 3996078 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 99901825 is about 9995.0900446169. The cubic root of 99901825 is about 464.0069376316.

The spelling of 99901825 in words is "ninety-nine million, nine hundred one thousand, eight hundred twenty-five".