981961579 has 2 divisors, whose sum is σ = 981961580. Its totient is φ = 981961578.

The previous prime is 981961567. The next prime is 981961583. The reversal of 981961579 is 975169189.

It is a strong prime.

It is an emirp because it is prime and its reverse (975169189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981961579 - 2⁹ = 981961067 is a prime.

It is not a weakly prime, because it can be changed into another prime (981961559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490980789 + 490980790.

It is an arithmetic number, because the mean of its divisors is an integer number (490980790).

Almost surely, 2^981961579 is an apocalyptic number.

981961579 is a deficient number, since it is larger than the sum of its proper divisors (1).

981961579 is an equidigital number, since it uses as much as digits as its factorization.

981961579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 55.

The square root of 981961579 is about 31336.2661942995. The cubic root of 981961579 is about 993.9506724263.

The spelling of 981961579 in words is "nine hundred eighty-one million, nine hundred sixty-one thousand, five hundred seventy-nine".