981249128 has 16 divisors (see below), whose sum is σ = 1840310880. Its totient is φ = 490499568.

The previous prime is 981249083. The next prime is 981249131. The reversal of 981249128 is 821942189.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23501 + ... + 50147.

It is an arithmetic number, because the mean of its divisors is an integer number (115019430).

Almost surely, 2^981249128 is an apocalyptic number.

It is an amenable number.

981249128 is a deficient number, since it is larger than the sum of its proper divisors (859061752).

981249128 is a wasteful number, since it uses less digits than its factorization.

981249128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31256 (or 31252 counting only the distinct ones).

The product of its digits is 82944, while the sum is 44.

The square root of 981249128 is about 31324.8962967158. The cubic root of 981249128 is about 993.7102310839.

The spelling of 981249128 in words is "nine hundred eighty-one million, two hundred forty-nine thousand, one hundred twenty-eight".