99889491 has 8 divisors (see below), whose sum is σ = 143431120. Its totient is φ = 61470432.

The previous prime is 99889487. The next prime is 99889541. The reversal of 99889491 is 19498899.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99889491 - 2² = 99889487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99889411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1280596 + ... + 1280673.

It is an arithmetic number, because the mean of its divisors is an integer number (17928890).

Almost surely, 2^99889491 is an apocalyptic number.

99889491 is a deficient number, since it is larger than the sum of its proper divisors (43541629).

99889491 is a wasteful number, since it uses less digits than its factorization.

99889491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2561285.

The product of its digits is 1679616, while the sum is 57.

The square root of 99889491 is about 9994.4730226261. The cubic root of 99889491 is about 463.9878412267.

The spelling of 99889491 in words is "ninety-nine million, eight hundred eighty-nine thousand, four hundred ninety-one".