981374891 has 6 divisors (see below), whose sum is σ = 1141599420. Its totient is φ = 841178436.

The previous prime is 981374887. The next prime is 981374897. The reversal of 981374891 is 198473189.

It is not a de Polignac number, because 981374891 - 2² = 981374887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981374897) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10013981 + ... + 10014078.

It is an arithmetic number, because the mean of its divisors is an integer number (190266570).

Almost surely, 2^981374891 is an apocalyptic number.

981374891 is a deficient number, since it is larger than the sum of its proper divisors (160224529).

981374891 is a wasteful number, since it uses less digits than its factorization.

981374891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20028073 (or 20028066 counting only the distinct ones).

The product of its digits is 435456, while the sum is 50.

The square root of 981374891 is about 31326.9036293088. The cubic root of 981374891 is about 993.7526826345.

The spelling of 981374891 in words is "nine hundred eighty-one million, three hundred seventy-four thousand, eight hundred ninety-one".