249291247 has 8 divisors (see below), whose sum is σ = 267137136. Its totient is φ = 231798912.

The previous prime is 249291241. The next prime is 249291257. The reversal of 249291247 is 742192942.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 249291247 - 2¹¹ = 249289199 is a prime.

It is a super-2 number, since 2×249291247² = 124292251661630018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249291241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86928 + ... + 89749.

It is an arithmetic number, because the mean of its divisors is an integer number (33392142).

Almost surely, 2^249291247 is an apocalyptic number.

249291247 is a deficient number, since it is larger than the sum of its proper divisors (17845889).

249291247 is a wasteful number, since it uses less digits than its factorization.

249291247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176777.

The product of its digits is 72576, while the sum is 40.

The square root of 249291247 is about 15788.9596554048. The cubic root of 249291247 is about 629.3646462685.

It can be divided in two parts, 2492 and 91247, that added together give a palindrome (93739).

The spelling of 249291247 in words is "two hundred forty-nine million, two hundred ninety-one thousand, two hundred forty-seven".