249781145291 has 4 divisors (see below), whose sum is σ = 255095637792. Its totient is φ = 244466652792.

The previous prime is 249781145281. The next prime is 249781145293. The reversal of 249781145291 is 192541187942.

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 249781145291 - 2⁶ = 249781145227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249781145293) 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, 2657246180 + ... + 2657246273.

It is an arithmetic number, because the mean of its divisors is an integer number (63773909448).

Almost surely, 2^249781145291 is an apocalyptic number.

249781145291 is a deficient number, since it is larger than the sum of its proper divisors (5314492501).

249781145291 is an equidigital number, since it uses as much as digits as its factorization.

249781145291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5314492500.

The product of its digits is 1451520, while the sum is 53.

The spelling of 249781145291 in words is "two hundred forty-nine billion, seven hundred eighty-one million, one hundred forty-five thousand, two hundred ninety-one".