1256141 has 4 divisors (see below), whose sum is σ = 1260000. Its totient is φ = 1252284.

The previous prime is 1256107. The next prime is 1256149. The reversal of 1256141 is 1416521.

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 a cyclic number.

It is not a de Polignac number, because 1256141 - 2¹⁰ = 1255117 is a prime.

It is an Ulam number.

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

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256149) 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, 1391 + ... + 2108.

It is an arithmetic number, because the mean of its divisors is an integer number (315000).

2^1256141 is an apocalyptic number.

It is an amenable number.

1256141 is a deficient number, since it is larger than the sum of its proper divisors (3859).

1256141 is an equidigital number, since it uses as much as digits as its factorization.

1256141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3858.

The product of its digits is 240, while the sum is 20.

The square root of 1256141 is about 1120.7769626469. The cubic root of 1256141 is about 107.8978515189.

The spelling of 1256141 in words is "one million, two hundred fifty-six thousand, one hundred forty-one".