1247617243 has 2 divisors, whose sum is σ = 1247617244. Its totient is φ = 1247617242.

The previous prime is 1247617223. The next prime is 1247617247. The reversal of 1247617243 is 3427167421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1247617243 - 2¹⁷ = 1247486171 is a prime.

It is not a weakly prime, because it can be changed into another prime (1247617247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623808621 + 623808622.

It is an arithmetic number, because the mean of its divisors is an integer number (623808622).

Almost surely, 2^1247617243 is an apocalyptic number.

1247617243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247617243 is an equidigital number, since it uses as much as digits as its factorization.

1247617243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 37.

The square root of 1247617243 is about 35321.6257128689. The cubic root of 1247617243 is about 1076.5324437320.

The spelling of 1247617243 in words is "one billion, two hundred forty-seven million, six hundred seventeen thousand, two hundred forty-three".