851106391 has 4 divisors (see below), whose sum is σ = 851248384. Its totient is φ = 850964400.

The previous prime is 851106379. The next prime is 851106419. The reversal of 851106391 is 193601158.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 851106391 - 2⁵ = 851106359 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 (851106341) 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, 61590 + ... + 74131.

It is an arithmetic number, because the mean of its divisors is an integer number (212812096).

Almost surely, 2^851106391 is an apocalyptic number.

851106391 is a deficient number, since it is larger than the sum of its proper divisors (141993).

851106391 is a wasteful number, since it uses less digits than its factorization.

851106391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141992.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 851106391 is about 29173.7277528944. The cubic root of 851106391 is about 947.6790586190.

The spelling of 851106391 in words is "eight hundred fifty-one million, one hundred six thousand, three hundred ninety-one".