842747249 has 2 divisors, whose sum is σ = 842747250. Its totient is φ = 842747248.

The previous prime is 842747231. The next prime is 842747263. The reversal of 842747249 is 942747248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 560742400 + 282004849 = 23680^2 + 16793^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842747249 is a prime.

It is not a weakly prime, because it can be changed into another prime (842743249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421373624 + 421373625.

It is an arithmetic number, because the mean of its divisors is an integer number (421373625).

Almost surely, 2^842747249 is an apocalyptic number.

It is an amenable number.

842747249 is a deficient number, since it is larger than the sum of its proper divisors (1).

842747249 is an equidigital number, since it uses as much as digits as its factorization.

842747249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 903168, while the sum is 47.

The square root of 842747249 is about 29030.1093521881. The cubic root of 842747249 is about 944.5663021138.

Subtracting 842747249 from its reverse (942747248), we obtain a palindrome (99999999).

The spelling of 842747249 in words is "eight hundred forty-two million, seven hundred forty-seven thousand, two hundred forty-nine".