981654921 has 36 divisors (see below), whose sum is σ = 1561575600. Its totient is φ = 593802144.

The previous prime is 981654913. The next prime is 981654943. The reversal of 981654921 is 129456189.

981654921 is a `hidden beast` number, since 9 + 81 + 6 + 549 + 21 = 666.

981654921 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 981654921 - 2³ = 981654913 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (981654991) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 84270 + ... + 95208.

It is an arithmetic number, because the mean of its divisors is an integer number (43377100).

Almost surely, 2^981654921 is an apocalyptic number.

It is an amenable number.

981654921 is a deficient number, since it is larger than the sum of its proper divisors (579920679).

981654921 is a wasteful number, since it uses less digits than its factorization.

981654921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11030 (or 11014 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 981654921 is about 31331.3727915009. The cubic root of 981654921 is about 993.8471942909.

The spelling of 981654921 in words is "nine hundred eighty-one million, six hundred fifty-four thousand, nine hundred twenty-one".