99761409 has 16 divisors (see below), whose sum is σ = 161231040. Its totient is φ = 60461280.

The previous prime is 99761407. The next prime is 99761443. The reversal of 99761409 is 90416799.

It is not a de Polignac number, because 99761409 - 2¹ = 99761407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99761407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167652 + ... + 168245.

It is an arithmetic number, because the mean of its divisors is an integer number (10076940).

Almost surely, 2^99761409 is an apocalyptic number.

99761409 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

It is an amenable number.

99761409 is a deficient number, since it is larger than the sum of its proper divisors (61469631).

99761409 is a wasteful number, since it uses less digits than its factorization.

99761409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335917 (or 335911 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 99761409 is about 9988.0633257904. The cubic root of 99761409 is about 463.7894422805.

The spelling of 99761409 in words is "ninety-nine million, seven hundred sixty-one thousand, four hundred nine".