845831491 has 2 divisors, whose sum is σ = 845831492. Its totient is φ = 845831490.

The previous prime is 845831489. The next prime is 845831527. The reversal of 845831491 is 194138548.

845831491 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 is a cyclic number.

It is not a de Polignac number, because 845831491 - 2¹ = 845831489 is a prime.

It is a super-2 number, since 2×845831491² = 1430861822334566162, which contains 22 as substring.

Together with 845831489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (845831401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422915745 + 422915746.

It is an arithmetic number, because the mean of its divisors is an integer number (422915746).

Almost surely, 2^845831491 is an apocalyptic number.

845831491 is a deficient number, since it is larger than the sum of its proper divisors (1).

845831491 is an equidigital number, since it uses as much as digits as its factorization.

845831491 is an odious number, because the sum of its binary digits is odd.

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

The square root of 845831491 is about 29083.1822708589. The cubic root of 845831491 is about 945.7171906027.

The spelling of 845831491 in words is "eight hundred forty-five million, eight hundred thirty-one thousand, four hundred ninety-one".