249687055 has 4 divisors (see below), whose sum is σ = 299624472. Its totient is φ = 199749640.

The previous prime is 249687047. The next prime is 249687131. The reversal of 249687055 is 550786942.

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

It is not a de Polignac number, because 249687055 - 2³ = 249687047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249686996 and 249687014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24968701 + ... + 24968710.

It is an arithmetic number, because the mean of its divisors is an integer number (74906118).

Almost surely, 2^249687055 is an apocalyptic number.

249687055 is a deficient number, since it is larger than the sum of its proper divisors (49937417).

249687055 is an equidigital number, since it uses as much as digits as its factorization.

249687055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49937416.

The product of its (nonzero) digits is 604800, while the sum is 46.

The square root of 249687055 is about 15801.4890121153. The cubic root of 249687055 is about 629.6975578626.

It can be divided in two parts, 24968 and 7055, that added together give a palindrome (32023).

The spelling of 249687055 in words is "two hundred forty-nine million, six hundred eighty-seven thousand, fifty-five".