981090649 has 16 divisors (see below), whose sum is σ = 1231401600. Its totient is φ = 759346560.

The previous prime is 981090601. The next prime is 981090653. The reversal of 981090649 is 946090189.

981090649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 981090649 - 2²³ = 972702041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 981090599 and 981090608.

It is not an unprimeable number, because it can be changed into a prime (981090659) 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, 31284 + ... + 54229.

It is an arithmetic number, because the mean of its divisors is an integer number (76962600).

Almost surely, 2^981090649 is an apocalyptic number.

It is an amenable number.

981090649 is a deficient number, since it is larger than the sum of its proper divisors (250310951).

981090649 is a wasteful number, since it uses less digits than its factorization.

981090649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85680.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 981090649 is about 31322.3665932190. The cubic root of 981090649 is about 993.6567310168.

The spelling of 981090649 in words is "nine hundred eighty-one million, ninety thousand, six hundred forty-nine".