1256105 has 4 divisors (see below), whose sum is σ = 1507332. Its totient is φ = 1004880.

The previous prime is 1256063. The next prime is 1256107. The reversal of 1256105 is 5016521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 753424 + 502681 = 868^2 + 709^2 .

It is not a de Polignac number, because 1256105 - 2⁶ = 1256041 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125606 + ... + 125615.

It is an arithmetic number, because the mean of its divisors is an integer number (376833).

2^1256105 is an apocalyptic number.

It is an amenable number.

1256105 is a deficient number, since it is larger than the sum of its proper divisors (251227).

1256105 is an equidigital number, since it uses as much as digits as its factorization.

1256105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251226.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1256105 is about 1120.7609022445. The cubic root of 1256105 is about 107.8968207536.

The spelling of 1256105 in words is "one million, two hundred fifty-six thousand, one hundred five".