99779873 has 2 divisors, whose sum is σ = 99779874. Its totient is φ = 99779872.

The previous prime is 99779839. The next prime is 99779879. The reversal of 99779873 is 37897799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78730129 + 21049744 = 8873^2 + 4588^2 .

It is a cyclic number.

It is not a de Polignac number, because 99779873 - 2⁶ = 99779809 is a prime.

It is a super-2 number, since 2×99779873² = 19912046111792258, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (99779879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49889936 + 49889937.

It is an arithmetic number, because the mean of its divisors is an integer number (49889937).

Almost surely, 2^99779873 is an apocalyptic number.

It is an amenable number.

99779873 is a deficient number, since it is larger than the sum of its proper divisors (1).

99779873 is an equidigital number, since it uses as much as digits as its factorization.

99779873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6001128, while the sum is 59.

The square root of 99779873 is about 9988.9875863373. The cubic root of 99779873 is about 463.8180534775.

The spelling of 99779873 in words is "ninety-nine million, seven hundred seventy-nine thousand, eight hundred seventy-three".