1999487579 has 2 divisors, whose sum is σ = 1999487580. Its totient is φ = 1999487578.

The previous prime is 1999487561. The next prime is 1999487597. The reversal of 1999487579 is 9757849991.

Together with next prime (1999487597) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (1999487561) and next prime (1999487597).

It is a cyclic number.

It is not a de Polignac number, because 1999487579 - 2¹⁶ = 1999422043 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1999487509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999743789 + 999743790.

It is an arithmetic number, because the mean of its divisors is an integer number (999743790).

Almost surely, 2^1999487579 is an apocalyptic number.

1999487579 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999487579 is an equidigital number, since it uses as much as digits as its factorization.

1999487579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51438240, while the sum is 68.

The square root of 1999487579 is about 44715.6301420432. The cubic root of 1999487579 is about 1259.8134390366.

The spelling of 1999487579 in words is "one billion, nine hundred ninety-nine million, four hundred eighty-seven thousand, five hundred seventy-nine".