990971311 has 4 divisors (see below), whose sum is σ = 1081059624. Its totient is φ = 900883000.

The previous prime is 990971273. The next prime is 990971323. The reversal of 990971311 is 113179099.

990971311 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113179099 = 11 ⋅10289009.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990971311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990971341) 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, 45044140 + ... + 45044161.

It is an arithmetic number, because the mean of its divisors is an integer number (270264906).

Almost surely, 2^990971311 is an apocalyptic number.

990971311 is a deficient number, since it is larger than the sum of its proper divisors (90088313).

990971311 is a wasteful number, since it uses less digits than its factorization.

990971311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90088312.

The product of its (nonzero) digits is 15309, while the sum is 40.

The square root of 990971311 is about 31479.6968060367. The cubic root of 990971311 is about 996.9813338236.

The spelling of 990971311 in words is "nine hundred ninety million, nine hundred seventy-one thousand, three hundred eleven".