981901979 has 2 divisors, whose sum is σ = 981901980. Its totient is φ = 981901978.

The previous prime is 981901939. The next prime is 981902027. The reversal of 981901979 is 979109189.

981901979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981901979 - 2²⁴ = 965124763 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 981901979.

It is not a weakly prime, because it can be changed into another prime (981901909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490950989 + 490950990.

It is an arithmetic number, because the mean of its divisors is an integer number (490950990).

Almost surely, 2^981901979 is an apocalyptic number.

981901979 is a deficient number, since it is larger than the sum of its proper divisors (1).

981901979 is an equidigital number, since it uses as much as digits as its factorization.

981901979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 53.

The square root of 981901979 is about 31335.3152050526. The cubic root of 981901979 is about 993.9305627941.

The spelling of 981901979 in words is "nine hundred eighty-one million, nine hundred one thousand, nine hundred seventy-nine".