855713981 has 4 divisors (see below), whose sum is σ = 866023872. Its totient is φ = 845404092.

The previous prime is 855713959. The next prime is 855714043. The reversal of 855713981 is 189317558.

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 a de Polignac number, because none of the positive numbers 2^k-855713981 is a prime.

It is a super-2 number, since 2×855713981² = 1464492834557736722, which 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 (855713941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5154821 + ... + 5154986.

It is an arithmetic number, because the mean of its divisors is an integer number (216505968).

Almost surely, 2^855713981 is an apocalyptic number.

It is an amenable number.

855713981 is a deficient number, since it is larger than the sum of its proper divisors (10309891).

855713981 is a wasteful number, since it uses less digits than its factorization.

855713981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10309890.

The product of its digits is 302400, while the sum is 47.

The square root of 855713981 is about 29252.5893041966. The cubic root of 855713981 is about 949.3861153079.

The spelling of 855713981 in words is "eight hundred fifty-five million, seven hundred thirteen thousand, nine hundred eighty-one".