851934649 has 4 divisors (see below), whose sum is σ = 852334336. Its totient is φ = 851534964.

The previous prime is 851934641. The next prime is 851934661. The reversal of 851934649 is 946439158.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 851934649 - 2³ = 851934641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851934641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196629 + ... + 200914.

It is an arithmetic number, because the mean of its divisors is an integer number (213083584).

Almost surely, 2^851934649 is an apocalyptic number.

It is an amenable number.

851934649 is a deficient number, since it is larger than the sum of its proper divisors (399687).

851934649 is a wasteful number, since it uses less digits than its factorization.

851934649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399686.

The product of its digits is 933120, while the sum is 49.

The square root of 851934649 is about 29187.9195730014. The cubic root of 851934649 is about 947.9863716610.

The spelling of 851934649 in words is "eight hundred fifty-one million, nine hundred thirty-four thousand, six hundred forty-nine".