249999999989 has 16 divisors (see below), whose sum is σ = 253636575360. Its totient is φ = 246391934400.

The previous prime is 249999999973. The next prime is 250000000007. The reversal of 249999999989 is 989999999942.

It is a cyclic number.

It is not a de Polignac number, because 249999999989 - 2⁴ = 249999999973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249999999289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41408279 + ... + 41414315.

It is an arithmetic number, because the mean of its divisors is an integer number (15852285960).

Almost surely, 2^249999999989 is an apocalyptic number.

It is an amenable number.

249999999989 is a deficient number, since it is larger than the sum of its proper divisors (3636575371).

249999999989 is a wasteful number, since it uses less digits than its factorization.

249999999989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8300.

The product of its digits is 24794911296, while the sum is 95.

The spelling of 249999999989 in words is "two hundred forty-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-nine".