981978441 has 4 divisors (see below), whose sum is σ = 1309304592. Its totient is φ = 654652292.

The previous prime is 981978421. The next prime is 981978443. The reversal of 981978441 is 144879189.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 981978441 - 2¹⁴ = 981962057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (981978443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163663071 + ... + 163663076.

It is an arithmetic number, because the mean of its divisors is an integer number (327326148).

Almost surely, 2^981978441 is an apocalyptic number.

It is an amenable number.

981978441 is a deficient number, since it is larger than the sum of its proper divisors (327326151).

981978441 is a wasteful number, since it uses less digits than its factorization.

981978441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327326150.

The product of its digits is 580608, while the sum is 51.

The square root of 981978441 is about 31336.5352424291. The cubic root of 981978441 is about 993.9563616850.

The spelling of 981978441 in words is "nine hundred eighty-one million, nine hundred seventy-eight thousand, four hundred forty-one".