249999899 has 4 divisors (see below), whose sum is σ = 254098320. Its totient is φ = 245901480.

The previous prime is 249999889. The next prime is 249999917. The reversal of 249999899 is 998999942.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 249999899 - 2²⁰ = 248951323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249999809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2049119 + ... + 2049240.

It is an arithmetic number, because the mean of its divisors is an integer number (63524580).

Almost surely, 2^249999899 is an apocalyptic number.

249999899 is a deficient number, since it is larger than the sum of its proper divisors (4098421).

249999899 is an equidigital number, since it uses as much as digits as its factorization.

249999899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4098420.

The product of its digits is 34012224, while the sum is 68.

The square root of 249999899 is about 15811.3851069411. The cubic root of 249999899 is about 629.9604401127.

The spelling of 249999899 in words is "two hundred forty-nine million, nine hundred ninety-nine thousand, eight hundred ninety-nine".