851985542 has 4 divisors (see below), whose sum is σ = 1277978316. Its totient is φ = 425992770.

The previous prime is 851985523. The next prime is 851985551. The reversal of 851985542 is 245589158.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212996384 + ... + 212996387.

It is an arithmetic number, because the mean of its divisors is an integer number (319494579).

Almost surely, 2^851985542 is an apocalyptic number.

851985542 is a deficient number, since it is larger than the sum of its proper divisors (425992774).

851985542 is a wasteful number, since it uses less digits than its factorization.

851985542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425992773.

The product of its digits is 576000, while the sum is 47.

The square root of 851985542 is about 29188.7913761430. The cubic root of 851985542 is about 948.0052482692.

The spelling of 851985542 in words is "eight hundred fifty-one million, nine hundred eighty-five thousand, five hundred forty-two".