249297487 has 4 divisors (see below), whose sum is σ = 249342856. Its totient is φ = 249252120.

The previous prime is 249297463. The next prime is 249297491. The reversal of 249297487 is 784792942.

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 249297487 - 2¹¹ = 249295439 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 (249297407) 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, 13089 + ... + 25882.

It is an arithmetic number, because the mean of its divisors is an integer number (62335714).

Almost surely, 2^249297487 is an apocalyptic number.

249297487 is a deficient number, since it is larger than the sum of its proper divisors (45369).

249297487 is an equidigital number, since it uses as much as digits as its factorization.

249297487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45368.

The product of its digits is 2032128, while the sum is 52.

The square root of 249297487 is about 15789.1572606013. The cubic root of 249297487 is about 629.3698974258.

The spelling of 249297487 in words is "two hundred forty-nine million, two hundred ninety-seven thousand, four hundred eighty-seven".