249647549287 has 4 divisors (see below), whose sum is σ = 250216222960. Its totient is φ = 249078875616.

The previous prime is 249647549209. The next prime is 249647549321. The reversal of 249647549287 is 782945746942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782945746942 = 2 ⋅391472873471.

It is a cyclic number.

It is not a de Polignac number, because 249647549287 - 2³¹ = 247500065639 is a prime.

It is a super-4 number, since 4×249647549287⁴ (a number of 47 digits) contains 4444 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 (249647549587) 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, 284336178 + ... + 284337055.

It is an arithmetic number, because the mean of its divisors is an integer number (62554055740).

Almost surely, 2^249647549287 is an apocalyptic number.

249647549287 is a deficient number, since it is larger than the sum of its proper divisors (568673673).

249647549287 is an equidigital number, since it uses as much as digits as its factorization.

249647549287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568673672.

The product of its digits is 243855360, while the sum is 67.

The spelling of 249647549287 in words is "two hundred forty-nine billion, six hundred forty-seven million, five hundred forty-nine thousand, two hundred eighty-seven".