990972811 has 2 divisors, whose sum is σ = 990972812. Its totient is φ = 990972810.

The previous prime is 990972809. The next prime is 990972821. The reversal of 990972811 is 118279099.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (118279099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990972811 - 2¹ = 990972809 is a prime.

It is a super-2 number, since 2×990972811² = 1964054224282483442, which contains 22 as substring.

Together with 990972809, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (990972821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495486405 + 495486406.

It is an arithmetic number, because the mean of its divisors is an integer number (495486406).

Almost surely, 2^990972811 is an apocalyptic number.

990972811 is a deficient number, since it is larger than the sum of its proper divisors (1).

990972811 is an equidigital number, since it uses as much as digits as its factorization.

990972811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 46.

The square root of 990972811 is about 31479.7206309078. The cubic root of 990972811 is about 996.9818368557.

The spelling of 990972811 in words is "nine hundred ninety million, nine hundred seventy-two thousand, eight hundred eleven".