847425749 has 2 divisors, whose sum is σ = 847425750. Its totient is φ = 847425748.

The previous prime is 847425737. The next prime is 847425757. The reversal of 847425749 is 947524748.

847425749 = 16806² + 16807² + 16808².

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 758727025 + 88698724 = 27545^2 + 9418^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-847425749 is a prime.

It is a super-2 number, since 2×847425749² = 1436260800136422002, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 847425697 and 847425706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (847425049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423712874 + 423712875.

It is an arithmetic number, because the mean of its divisors is an integer number (423712875).

Almost surely, 2^847425749 is an apocalyptic number.

It is an amenable number.

847425749 is a deficient number, since it is larger than the sum of its proper divisors (1).

847425749 is an equidigital number, since it uses as much as digits as its factorization.

847425749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 50.

The square root of 847425749 is about 29110.5779571619. The cubic root of 847425749 is about 946.3109932432.

The spelling of 847425749 in words is "eight hundred forty-seven million, four hundred twenty-five thousand, seven hundred forty-nine".