249147917 has 2 divisors, whose sum is σ = 249147918. Its totient is φ = 249147916.

The previous prime is 249147907. The next prime is 249147929. The reversal of 249147917 is 719741942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238578916 + 10569001 = 15446^2 + 3251^2 .

It is a cyclic number.

It is not a de Polignac number, because 249147917 - 2⁴ = 249147901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249147907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124573958 + 124573959.

It is an arithmetic number, because the mean of its divisors is an integer number (124573959).

Almost surely, 2^249147917 is an apocalyptic number.

It is an amenable number.

249147917 is a deficient number, since it is larger than the sum of its proper divisors (1).

249147917 is an equidigital number, since it uses as much as digits as its factorization.

249147917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 44.

The square root of 249147917 is about 15784.4200717036. The cubic root of 249147917 is about 629.2440054124.

The spelling of 249147917 in words is "two hundred forty-nine million, one hundred forty-seven thousand, nine hundred seventeen".