981644461 has 16 divisors (see below), whose sum is σ = 1165478400. Its totient is φ = 808956288.

The previous prime is 981644449. The next prime is 981644471. The reversal of 981644461 is 164446189.

981644461 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 981644461 - 2¹⁷ = 981513389 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 (981644401) 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, 38401 + ... + 58633.

It is an arithmetic number, because the mean of its divisors is an integer number (72842400).

Almost surely, 2^981644461 is an apocalyptic number.

It is an amenable number.

981644461 is a deficient number, since it is larger than the sum of its proper divisors (183833939).

981644461 is a wasteful number, since it uses less digits than its factorization.

981644461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20508.

The product of its digits is 165888, while the sum is 43.

The square root of 981644461 is about 31331.2058657180. The cubic root of 981644461 is about 993.8436643068.

The spelling of 981644461 in words is "nine hundred eighty-one million, six hundred forty-four thousand, four hundred sixty-one".