1255581 has 12 divisors (see below), whose sum is σ = 1881152. Its totient is φ = 836892.

The previous prime is 1255567. The next prime is 1255591. The reversal of 1255581 is 1855521.

It is not a de Polignac number, because 1255581 - 2⁵ = 1255549 is a prime.

It is a super-2 number, since 2×1255581² = 3152967295122, which contains 22 as substring.

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 (1255591) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2341 + ... + 2826.

2^1255581 is an apocalyptic number.

It is an amenable number.

1255581 is a deficient number, since it is larger than the sum of its proper divisors (625571).

1255581 is an frugal number, since it uses more digits than its factorization.

1255581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5182 (or 5170 counting only the distinct ones).

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

The square root of 1255581 is about 1120.5271081058. The cubic root of 1255581 is about 107.8818151615.

The spelling of 1255581 in words is "one million, two hundred fifty-five thousand, five hundred eighty-one".