1285998499 has 2 divisors, whose sum is σ = 1285998500. Its totient is φ = 1285998498.

The previous prime is 1285998487. The next prime is 1285998503. The reversal of 1285998499 is 9948995821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1285998499 - 2⁹ = 1285997987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1285998499.

It is not a weakly prime, because it can be changed into another prime (1285998409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642999249 + 642999250.

It is an arithmetic number, because the mean of its divisors is an integer number (642999250).

Almost surely, 2^1285998499 is an apocalyptic number.

1285998499 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285998499 is an equidigital number, since it uses as much as digits as its factorization.

1285998499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16796160, while the sum is 64.

The square root of 1285998499 is about 35860.8212259563. The cubic root of 1285998499 is about 1087.4604906420.

The spelling of 1285998499 in words is "one billion, two hundred eighty-five million, nine hundred ninety-eight thousand, four hundred ninety-nine".