247247239 has 2 divisors, whose sum is σ = 247247240. Its totient is φ = 247247238.

The previous prime is 247247237. The next prime is 247247257. The reversal of 247247239 is 932742742.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 247247239 - 2¹ = 247247237 is a prime.

It is a super-2 number, since 2×247247239² = 122262394386246242, which contains 22 as substring.

Together with 247247237, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247247237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123623619 + 123623620.

It is an arithmetic number, because the mean of its divisors is an integer number (123623620).

Almost surely, 2^247247239 is an apocalyptic number.

247247239 is a deficient number, since it is larger than the sum of its proper divisors (1).

247247239 is an equidigital number, since it uses as much as digits as its factorization.

247247239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 40.

The square root of 247247239 is about 15724.0973985790. The cubic root of 247247239 is about 627.6398118120.

The spelling of 247247239 in words is "two hundred forty-seven million, two hundred forty-seven thousand, two hundred thirty-nine".