1255669 has 4 divisors (see below), whose sum is σ = 1289644. Its totient is φ = 1221696.

The previous prime is 1255663. The next prime is 1255679. The reversal of 1255669 is 9665521.

1255669 = 92² + 93² + ... + 165².

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9665521 = 31 ⋅311791.

It can be written as a sum of positive squares in 2 ways, for example, as 1199025 + 56644 = 1095^2 + 238^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255669 - 2⁹ = 1255157 is a prime.

It is a super-2 number, since 2×1255669² = 3153409275122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255663) 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 3 ways as a sum of consecutive naturals, for example, 16932 + ... + 17005.

It is an arithmetic number, because the mean of its divisors is an integer number (322411).

2^1255669 is an apocalyptic number.

It is an amenable number.

1255669 is a deficient number, since it is larger than the sum of its proper divisors (33975).

1255669 is an equidigital number, since it uses as much as digits as its factorization.

1255669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33974.

The product of its digits is 16200, while the sum is 34.

The square root of 1255669 is about 1120.5663746517. The cubic root of 1255669 is about 107.8843354762.

The spelling of 1255669 in words is "one million, two hundred fifty-five thousand, six hundred sixty-nine".