1991459579 has 2 divisors, whose sum is σ = 1991459580. Its totient is φ = 1991459578.

The previous prime is 1991459557. The next prime is 1991459633. The reversal of 1991459579 is 9759541991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1991459579 - 2¹⁶ = 1991394043 is a prime.

It is a super-2 number, since 2×1991459579² = 7931822509581714482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1991450579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995729789 + 995729790.

It is an arithmetic number, because the mean of its divisors is an integer number (995729790).

Almost surely, 2^1991459579 is an apocalyptic number.

1991459579 is a deficient number, since it is larger than the sum of its proper divisors (1).

1991459579 is an equidigital number, since it uses as much as digits as its factorization.

1991459579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4592700, while the sum is 59.

The square root of 1991459579 is about 44625.7725871497. The cubic root of 1991459579 is about 1258.1251150918.

The spelling of 1991459579 in words is "one billion, nine hundred ninety-one million, four hundred fifty-nine thousand, five hundred seventy-nine".