981555850 has 24 divisors (see below), whose sum is σ = 1991667168. Its totient is φ = 356929200.

The previous prime is 981555823. The next prime is 981555851. The reversal of 981555850 is 58555189.

It is a happy number.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 981555850.

It is not an unprimeable number, because it can be changed into a prime (981555851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 891774 + ... + 892873.

It is an arithmetic number, because the mean of its divisors is an integer number (82986132).

Almost surely, 2^981555850 is an apocalyptic number.

981555850 is an abundant number, since it is smaller than the sum of its proper divisors (1010111318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

981555850 is a wasteful number, since it uses less digits than its factorization.

981555850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784670 (or 1784665 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 46.

The square root of 981555850 is about 31329.7917324709. The cubic root of 981555850 is about 993.8137593414.

The spelling of 981555850 in words is "nine hundred eighty-one million, five hundred fifty-five thousand, eight hundred fifty".