99776641 has 4 divisors (see below), whose sum is σ = 102097072. Its totient is φ = 97456212.

The previous prime is 99776609. The next prime is 99776659. The reversal of 99776641 is 14667799.

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: 14667799 = 37 ⋅396427.

It is a cyclic number.

It is not a de Polignac number, because 99776641 - 2⁵ = 99776609 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99776041) 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 3 ways as a sum of consecutive naturals, for example, 1160151 + ... + 1160236.

It is an arithmetic number, because the mean of its divisors is an integer number (25524268).

Almost surely, 2^99776641 is an apocalyptic number.

It is an amenable number.

99776641 is a deficient number, since it is larger than the sum of its proper divisors (2320431).

99776641 is a wasteful number, since it uses less digits than its factorization.

99776641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320430.

The product of its digits is 571536, while the sum is 49.

The square root of 99776641 is about 9988.8258068704. The cubic root of 99776641 is about 463.8130455333.

The spelling of 99776641 in words is "ninety-nine million, seven hundred seventy-six thousand, six hundred forty-one".