99991925 has 24 divisors (see below), whose sum is σ = 141151680. Its totient is φ = 69555200.

The previous prime is 99991901. The next prime is 99991933. The reversal of 99991925 is 52919999.

It is not a de Polignac number, because 99991925 - 2¹⁴ = 99975541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1580 + ... + 14229.

It is an arithmetic number, because the mean of its divisors is an integer number (5881320).

Almost surely, 2^99991925 is an apocalyptic number.

It is an amenable number.

99991925 is a deficient number, since it is larger than the sum of its proper divisors (41159755).

99991925 is a wasteful number, since it uses less digits than its factorization.

99991925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15853 (or 15848 counting only the distinct ones).

The product of its digits is 590490, while the sum is 53.

The square root of 99991925 is about 9999.5962418490. The cubic root of 99991925 is about 464.1463894150.

The spelling of 99991925 in words is "ninety-nine million, nine hundred ninety-one thousand, nine hundred twenty-five".