990981061 has 16 divisors (see below), whose sum is σ = 1170178048. Its totient is φ = 821242800.

The previous prime is 990981037. The next prime is 990981067. The reversal of 990981061 is 160189099.

990981061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-990981061 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 990980999 and 990981017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990981067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 461356 + ... + 463498.

It is an arithmetic number, because the mean of its divisors is an integer number (73136128).

Almost surely, 2^990981061 is an apocalyptic number.

It is an amenable number.

990981061 is a deficient number, since it is larger than the sum of its proper divisors (179196987).

990981061 is a wasteful number, since it uses less digits than its factorization.

990981061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4312.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 990981061 is about 31479.8516673761. The cubic root of 990981061 is about 996.9846035234.

The spelling of 990981061 in words is "nine hundred ninety million, nine hundred eighty-one thousand, sixty-one".