99881057 has 4 divisors (see below), whose sum is σ = 100850880. Its totient is φ = 98911236.

The previous prime is 99881053. The next prime is 99881059. The reversal of 99881057 is 75018899.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75018899 = 4289 ⋅17491.

It is a cyclic number.

It is not a de Polignac number, because 99881057 - 2² = 99881053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99881053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 484757 + ... + 484962.

It is an arithmetic number, because the mean of its divisors is an integer number (25212720).

Almost surely, 2^99881057 is an apocalyptic number.

It is an amenable number.

99881057 is a deficient number, since it is larger than the sum of its proper divisors (969823).

99881057 is a wasteful number, since it uses less digits than its factorization.

99881057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969822.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 99881057 is about 9994.0510805178. The cubic root of 99881057 is about 463.9747821833.

The spelling of 99881057 in words is "ninety-nine million, eight hundred eighty-one thousand, fifty-seven".