855949557 has 4 divisors (see below), whose sum is σ = 1141266080. Its totient is φ = 570633036.

The previous prime is 855949513. The next prime is 855949561. The reversal of 855949557 is 755949558.

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 not a de Polignac number, because 855949557 - 2²⁶ = 788840693 is a prime.

It is a super-3 number, since 3×855949557³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 855949497 and 855949506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855942557) 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, 142658257 + ... + 142658262.

It is an arithmetic number, because the mean of its divisors is an integer number (285316520).

Almost surely, 2^855949557 is an apocalyptic number.

It is an amenable number.

855949557 is a deficient number, since it is larger than the sum of its proper divisors (285316523).

855949557 is a wasteful number, since it uses less digits than its factorization.

855949557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285316522.

The product of its digits is 11340000, while the sum is 57.

The square root of 855949557 is about 29256.6156108324. The cubic root of 855949557 is about 949.4732285521.

Subtracting from 855949557 its reverse (755949558), we obtain a palindrome (99999999).

The spelling of 855949557 in words is "eight hundred fifty-five million, nine hundred forty-nine thousand, five hundred fifty-seven".