851683149 has 6 divisors (see below), whose sum is σ = 1230209006. Its totient is φ = 567788760.

The previous prime is 851683117. The next prime is 851683171. The reversal of 851683149 is 941386158.

It can be written as a sum of positive squares in only one way, i.e., 830477124 + 21206025 = 28818^2 + 4605^2 .

It is not a de Polignac number, because 851683149 - 2⁵ = 851683117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851683109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47315722 + ... + 47315739.

Almost surely, 2^851683149 is an apocalyptic number.

It is an amenable number.

851683149 is a deficient number, since it is larger than the sum of its proper divisors (378525857).

851683149 is a wasteful number, since it uses less digits than its factorization.

851683149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94631467 (or 94631464 counting only the distinct ones).

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

The square root of 851683149 is about 29183.6109657458. The cubic root of 851683149 is about 947.8930773229.

The spelling of 851683149 in words is "eight hundred fifty-one million, six hundred eighty-three thousand, one hundred forty-nine".