981964821 has 32 divisors (see below), whose sum is σ = 1396517760. Its totient is φ = 612009216.

The previous prime is 981964799. The next prime is 981964831. The reversal of 981964821 is 128469189.

It is not a de Polignac number, because 981964821 - 2⁶ = 981964757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981964831) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1762675 + ... + 1763231.

It is an arithmetic number, because the mean of its divisors is an integer number (43641180).

Almost surely, 2^981964821 is an apocalyptic number.

It is an amenable number.

981964821 is a deficient number, since it is larger than the sum of its proper divisors (414552939).

981964821 is a wasteful number, since it uses less digits than its factorization.

981964821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933.

The product of its digits is 248832, while the sum is 48.

The square root of 981964821 is about 31336.3179234574. The cubic root of 981964821 is about 993.9517662860.

The spelling of 981964821 in words is "nine hundred eighty-one million, nine hundred sixty-four thousand, eight hundred twenty-one".