849172069 has 2 divisors, whose sum is σ = 849172070. Its totient is φ = 849172068.

The previous prime is 849172063. The next prime is 849172123. The reversal of 849172069 is 960271948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 446688225 + 402483844 = 21135^2 + 20062^2 .

It is a cyclic number.

It is not a de Polignac number, because 849172069 - 2¹⁵ = 849139301 is a prime.

It is a super-2 number, since 2×849172069² = 1442186405539481522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (849172063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424586034 + 424586035.

It is an arithmetic number, because the mean of its divisors is an integer number (424586035).

Almost surely, 2^849172069 is an apocalyptic number.

It is an amenable number.

849172069 is a deficient number, since it is larger than the sum of its proper divisors (1).

849172069 is an equidigital number, since it uses as much as digits as its factorization.

849172069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 849172069 is about 29140.5571154705. The cubic root of 849172069 is about 946.9605793375.

The spelling of 849172069 in words is "eight hundred forty-nine million, one hundred seventy-two thousand, sixty-nine".