845744257 has 2 divisors, whose sum is σ = 845744258. Its totient is φ = 845744256.

The previous prime is 845744239. The next prime is 845744287. The reversal of 845744257 is 752447548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 637259536 + 208484721 = 25244^2 + 14439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-845744257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (845744287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422872128 + 422872129.

It is an arithmetic number, because the mean of its divisors is an integer number (422872129).

Almost surely, 2^845744257 is an apocalyptic number.

It is an amenable number.

845744257 is a deficient number, since it is larger than the sum of its proper divisors (1).

845744257 is an equidigital number, since it uses as much as digits as its factorization.

845744257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1254400, while the sum is 46.

The square root of 845744257 is about 29081.6824994703. The cubic root of 845744257 is about 945.6846776137.

It can be divided in two parts, 84574 and 4257, that added together give a triangular number (88831 = T₄₂₁).

The spelling of 845744257 in words is "eight hundred forty-five million, seven hundred forty-four thousand, two hundred fifty-seven".