249975863 has 4 divisors (see below), whose sum is σ = 250027248. Its totient is φ = 249924480.

The previous prime is 249975851. The next prime is 249975889. The reversal of 249975863 is 368579942.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 368579942 = 2 ⋅184289971.

It is a cyclic number.

It is not a de Polignac number, because 249975863 - 2¹⁰ = 249974839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249975833) 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, 17531 + ... + 28412.

It is an arithmetic number, because the mean of its divisors is an integer number (62506812).

Almost surely, 2^249975863 is an apocalyptic number.

249975863 is a deficient number, since it is larger than the sum of its proper divisors (51385).

249975863 is an equidigital number, since it uses as much as digits as its factorization.

249975863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51384.

The product of its digits is 3265920, while the sum is 53.

The square root of 249975863 is about 15810.6250034589. The cubic root of 249975863 is about 629.9402504853.

The spelling of 249975863 in words is "two hundred forty-nine million, nine hundred seventy-five thousand, eight hundred sixty-three".