1255851 has 16 divisors (see below), whose sum is σ = 1877920. Its totient is φ = 829440.

The previous prime is 1255847. The next prime is 1255861. The reversal of 1255851 is 1585521.

It is not a de Polignac number, because 1255851 - 2² = 1255847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255801) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 5091 + ... + 5331.

It is an arithmetic number, because the mean of its divisors is an integer number (117370).

2^1255851 is an apocalyptic number.

1255851 is a deficient number, since it is larger than the sum of its proper divisors (622069).

1255851 is a wasteful number, since it uses less digits than its factorization.

1255851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 437 counting only the distinct ones).

The product of its digits is 2000, while the sum is 27.

The square root of 1255851 is about 1120.6475806425. The cubic root of 1255851 is about 107.8895475718.

The spelling of 1255851 in words is "one million, two hundred fifty-five thousand, eight hundred fifty-one".