981979 has 2 divisors, whose sum is σ = 981980. Its totient is φ = 981978.

The previous prime is 981961. The next prime is 981983. The reversal of 981979 is 979189.

It is a strong prime.

It is an emirp because it is prime and its reverse (979189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981979 - 2⁵ = 981947 is a prime.

It is not a weakly prime, because it can be changed into another prime (981919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490989 + 490990.

It is an arithmetic number, because the mean of its divisors is an integer number (490990).

2⁹⁸¹⁹⁷⁹ is an apocalyptic number.

981979 is a deficient number, since it is larger than the sum of its proper divisors (1).

981979 is an equidigital number, since it uses as much as digits as its factorization.

981979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 43.

The square root of 981979 is about 990.9485354952. The cubic root of 981979 is about 99.3956550291.

The spelling of 981979 in words is "nine hundred eighty-one thousand, nine hundred seventy-nine".