851427923831 has 4 divisors (see below), whose sum is σ = 861686091672. Its totient is φ = 841169755992.

The previous prime is 851427923821. The next prime is 851427923861. The reversal of 851427923831 is 138329724158.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851427923831 is a prime.

It is a super-2 number, since 2×851427923831² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851427923821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5129083796 + ... + 5129083961.

It is an arithmetic number, because the mean of its divisors is an integer number (215421522918).

Almost surely, 2^851427923831 is an apocalyptic number.

851427923831 is a deficient number, since it is larger than the sum of its proper divisors (10258167841).

851427923831 is a wasteful number, since it uses less digits than its factorization.

851427923831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10258167840.

The product of its digits is 2903040, while the sum is 53.

The spelling of 851427923831 in words is "eight hundred fifty-one billion, four hundred twenty-seven million, nine hundred twenty-three thousand, eight hundred thirty-one".