849194921 has 4 divisors (see below), whose sum is σ = 849269844. Its totient is φ = 849120000.

The previous prime is 849194903. The next prime is 849194947. The reversal of 849194921 is 129491948.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 531072025 + 318122896 = 23045^2 + 17836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-849194921 is a prime.

It is a super-2 number, since 2×849194921² = 1442264027704392482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (849194981) 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, 16580 + ... + 44421.

It is an arithmetic number, because the mean of its divisors is an integer number (212317461).

Almost surely, 2^849194921 is an apocalyptic number.

It is an amenable number.

849194921 is a deficient number, since it is larger than the sum of its proper divisors (74923).

849194921 is a wasteful number, since it uses less digits than its factorization.

849194921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74922.

The product of its digits is 186624, while the sum is 47.

The square root of 849194921 is about 29140.9492124056. The cubic root of 849194921 is about 946.9690737875.

The spelling of 849194921 in words is "eight hundred forty-nine million, one hundred ninety-four thousand, nine hundred twenty-one".