99991250 has 40 divisors (see below), whose sum is σ = 188939520. Its totient is φ = 39674000.

The previous prime is 99991249. The next prime is 99991271. The reversal of 99991250 is 5219999.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 208511 + ... + 208989.

It is an arithmetic number, because the mean of its divisors is an integer number (4723488).

Almost surely, 2^99991250 is an apocalyptic number.

99991250 is a deficient number, since it is larger than the sum of its proper divisors (88948270).

99991250 is a wasteful number, since it uses less digits than its factorization.

99991250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 65610, while the sum is 44.

The square root of 99991250 is about 9999.5624904293. The cubic root of 99991250 is about 464.1453449990.

The spelling of 99991250 in words is "ninety-nine million, nine hundred ninety-one thousand, two hundred fifty".