851891041 has 4 divisors (see below), whose sum is σ = 852085552. Its totient is φ = 851696532.

The previous prime is 851891023. The next prime is 851891057. The reversal of 851891041 is 140198158.

851891041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 140198158 = 2 ⋅70099079.

It is a cyclic number.

It is not a de Polignac number, because 851891041 - 2⁷ = 851890913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851891141) 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, 90531 + ... + 99496.

It is an arithmetic number, because the mean of its divisors is an integer number (213021388).

Almost surely, 2^851891041 is an apocalyptic number.

It is an amenable number.

851891041 is a deficient number, since it is larger than the sum of its proper divisors (194511).

851891041 is a wasteful number, since it uses less digits than its factorization.

851891041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194510.

The product of its (nonzero) digits is 11520, while the sum is 37.

The square root of 851891041 is about 29187.1725420603. The cubic root of 851891041 is about 947.9701965177.

The spelling of 851891041 in words is "eight hundred fifty-one million, eight hundred ninety-one thousand, forty-one".