845400169 has 2 divisors, whose sum is σ = 845400170. Its totient is φ = 845400168.

The previous prime is 845400151. The next prime is 845400173. The reversal of 845400169 is 961004548.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 620010000 + 225390169 = 24900^2 + 15013^2 .

It is a cyclic number.

It is not a de Polignac number, because 845400169 - 2¹³ = 845391977 is a prime.

It is a super-2 number, since 2×845400169² = 1429402891490457122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (845400109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422700084 + 422700085.

It is an arithmetic number, because the mean of its divisors is an integer number (422700085).

Almost surely, 2^845400169 is an apocalyptic number.

It is an amenable number.

845400169 is a deficient number, since it is larger than the sum of its proper divisors (1).

845400169 is an equidigital number, since it uses as much as digits as its factorization.

845400169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 845400169 is about 29075.7660088260. The cubic root of 845400169 is about 945.5564107507.

The spelling of 845400169 in words is "eight hundred forty-five million, four hundred thousand, one hundred sixty-nine".