851386149 has 18 divisors (see below), whose sum is σ = 1238379506. Its totient is φ = 563649120.

The previous prime is 851386141. The next prime is 851386187. The reversal of 851386149 is 941683158.

It can be written as a sum of positive squares in 3 ways, for example, as 55130625 + 796255524 = 7425^2 + 28218^2 .

It is not a de Polignac number, because 851386149 - 2³ = 851386141 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851386141) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 197679 + ... + 201939.

Almost surely, 2^851386149 is an apocalyptic number.

It is an amenable number.

851386149 is a deficient number, since it is larger than the sum of its proper divisors (386993357).

851386149 is a wasteful number, since it uses less digits than its factorization.

851386149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4565 (or 4413 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 851386149 is about 29178.5220496172. The cubic root of 851386149 is about 947.7828810310.

The spelling of 851386149 in words is "eight hundred fifty-one million, three hundred eighty-six thousand, one hundred forty-nine".