981000621 has 6 divisors (see below), whose sum is σ = 1417000910. Its totient is φ = 654000408.

The previous prime is 981000617. The next prime is 981000641. The reversal of 981000621 is 126000189.

It can be written as a sum of positive squares in only one way, i.e., 911194596 + 69806025 = 30186^2 + 8355^2 .

It is not a de Polignac number, because 981000621 - 2² = 981000617 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 (981000641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54500026 + ... + 54500043.

Almost surely, 2^981000621 is an apocalyptic number.

It is an amenable number.

981000621 is a deficient number, since it is larger than the sum of its proper divisors (436000289).

981000621 is a wasteful number, since it uses less digits than its factorization.

981000621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109000075 (or 109000072 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 981000621 is about 31320.9294402321. The cubic root of 981000621 is about 993.6263363858.

The spelling of 981000621 in words is "nine hundred eighty-one million, six hundred twenty-one", and thus it is an aban number.