845919457 has 4 divisors (see below), whose sum is σ = 855424260. Its totient is φ = 836414656.

The previous prime is 845919433. The next prime is 845919479. The reversal of 845919457 is 754919548.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157854096 + 688065361 = 12564^2 + 26231^2 .

It is a cyclic number.

It is not a de Polignac number, because 845919457 - 2⁷ = 845919329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (845919407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4752268 + ... + 4752445.

It is an arithmetic number, because the mean of its divisors is an integer number (213856065).

Almost surely, 2^845919457 is an apocalyptic number.

It is an amenable number.

845919457 is a deficient number, since it is larger than the sum of its proper divisors (9504803).

845919457 is an equidigital number, since it uses as much as digits as its factorization.

845919457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9504802.

The product of its digits is 1814400, while the sum is 52.

The square root of 845919457 is about 29084.6945488516. The cubic root of 845919457 is about 945.7499741517.

Subtracting from 845919457 its reverse (754919548), we obtain a palindrome (90999909).

The spelling of 845919457 in words is "eight hundred forty-five million, nine hundred nineteen thousand, four hundred fifty-seven".