249247147 has 2 divisors, whose sum is σ = 249247148. Its totient is φ = 249247146.

The previous prime is 249247123. The next prime is 249247153. The reversal of 249247147 is 741742942.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249247147 is a prime.

It is not a weakly prime, because it can be changed into another prime (249247177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124623573 + 124623574.

It is an arithmetic number, because the mean of its divisors is an integer number (124623574).

Almost surely, 2^249247147 is an apocalyptic number.

249247147 is a deficient number, since it is larger than the sum of its proper divisors (1).

249247147 is an equidigital number, since it uses as much as digits as its factorization.

249247147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 40.

The square root of 249247147 is about 15787.5630481718. The cubic root of 249247147 is about 629.3275322262.

The spelling of 249247147 in words is "two hundred forty-nine million, two hundred forty-seven thousand, one hundred forty-seven".