842650891 has 2 divisors, whose sum is σ = 842650892. Its totient is φ = 842650890.

The previous prime is 842650847. The next prime is 842650927. The reversal of 842650891 is 198056248.

It is a happy number.

842650891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-842650891 is a prime.

It is not a weakly prime, because it can be changed into another prime (842651891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421325445 + 421325446.

It is an arithmetic number, because the mean of its divisors is an integer number (421325446).

Almost surely, 2^842650891 is an apocalyptic number.

842650891 is a deficient number, since it is larger than the sum of its proper divisors (1).

842650891 is an equidigital number, since it uses as much as digits as its factorization.

842650891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 842650891 is about 29028.4496830265. The cubic root of 842650891 is about 944.5303008141.

The spelling of 842650891 in words is "eight hundred forty-two million, six hundred fifty thousand, eight hundred ninety-one".