249395143 has 4 divisors (see below), whose sum is σ = 249453928. Its totient is φ = 249336360.

The previous prime is 249395137. The next prime is 249395147. The reversal of 249395143 is 341593942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341593942 = 2 ⋅170796971.

It is a cyclic number.

It is not a de Polignac number, because 249395143 - 2²⁵ = 215840711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249395096 and 249395105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249395147) 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, 22488 + ... + 31693.

It is an arithmetic number, because the mean of its divisors is an integer number (62363482).

Almost surely, 2^249395143 is an apocalyptic number.

249395143 is a deficient number, since it is larger than the sum of its proper divisors (58785).

249395143 is an equidigital number, since it uses as much as digits as its factorization.

249395143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58784.

The product of its digits is 116640, while the sum is 40.

The square root of 249395143 is about 15792.2494597825. The cubic root of 249395143 is about 629.4520666229.

The spelling of 249395143 in words is "two hundred forty-nine million, three hundred ninety-five thousand, one hundred forty-three".