990673961 has 4 divisors (see below), whose sum is σ = 991674624. Its totient is φ = 989673300.

The previous prime is 990673949. The next prime is 990673987. The reversal of 990673961 is 169376099.

990673961 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 169376099 = 11087 ⋅15277.

It is a cyclic number.

It is not a de Polignac number, because 990673961 - 2¹⁰ = 990672937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (990673921) 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, 498845 + ... + 500826.

It is an arithmetic number, because the mean of its divisors is an integer number (247918656).

Almost surely, 2^990673961 is an apocalyptic number.

It is an amenable number.

990673961 is a deficient number, since it is larger than the sum of its proper divisors (1000663).

990673961 is an equidigital number, since it uses as much as digits as its factorization.

990673961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000662.

The product of its (nonzero) digits is 551124, while the sum is 50.

The square root of 990673961 is about 31474.9735663114. The cubic root of 990673961 is about 996.8816060607.

The spelling of 990673961 in words is "nine hundred ninety million, six hundred seventy-three thousand, nine hundred sixty-one".