99990811 has 4 divisors (see below), whose sum is σ = 103438800. Its totient is φ = 96542824.

The previous prime is 99990799. The next prime is 99990871. The reversal of 99990811 is 11809999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99990811 - 2⁹ = 99990299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99990871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1723951 + ... + 1724008.

It is an arithmetic number, because the mean of its divisors is an integer number (25859700).

Almost surely, 2^99990811 is an apocalyptic number.

99990811 is a deficient number, since it is larger than the sum of its proper divisors (3447989).

99990811 is a wasteful number, since it uses less digits than its factorization.

99990811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3447988.

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 99990811 is about 9999.5405394448. The cubic root of 99990811 is about 464.1446657392.

The spelling of 99990811 in words is "ninety-nine million, nine hundred ninety thousand, eight hundred eleven".