842491057 has 2 divisors, whose sum is σ = 842491058. Its totient is φ = 842491056.

The previous prime is 842491051. The next prime is 842491099. The reversal of 842491057 is 750194248.

842491057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 728514081 + 113976976 = 26991^2 + 10676^2 .

It is a cyclic number.

It is not a de Polignac number, because 842491057 - 2²³ = 834102449 is a prime.

It is a super-2 number, since 2×842491057² = 1419582362249954498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (842491051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421245528 + 421245529.

It is an arithmetic number, because the mean of its divisors is an integer number (421245529).

Almost surely, 2^842491057 is an apocalyptic number.

It is an amenable number.

842491057 is a deficient number, since it is larger than the sum of its proper divisors (1).

842491057 is an equidigital number, since it uses as much as digits as its factorization.

842491057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 842491057 is about 29025.6964946580. The cubic root of 842491057 is about 944.4705775432.

The spelling of 842491057 in words is "eight hundred forty-two million, four hundred ninety-one thousand, fifty-seven".