99507861 has 24 divisors (see below), whose sum is σ = 152006400. Its totient is φ = 62625600.

The previous prime is 99507839. The next prime is 99507869. The reversal of 99507861 is 16870599.

It is not a de Polignac number, because 99507861 - 2⁹ = 99507349 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99507869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7090 + ... + 15788.

It is an arithmetic number, because the mean of its divisors is an integer number (6333600).

Almost surely, 2^99507861 is an apocalyptic number.

It is an amenable number.

99507861 is a deficient number, since it is larger than the sum of its proper divisors (52498539).

99507861 is a wasteful number, since it uses less digits than its factorization.

99507861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8777 (or 8774 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 99507861 is about 9975.3627001729. The cubic root of 99507861 is about 463.3961951986.

The spelling of 99507861 in words is "ninety-nine million, five hundred seven thousand, eight hundred sixty-one".