1256291 has 4 divisors (see below), whose sum is σ = 1268592. Its totient is φ = 1243992.

The previous prime is 1256279. The next prime is 1256303. The reversal of 1256291 is 1926521.

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

It is an interprime number because it is at equal distance from previous prime (1256279) and next prime (1256303).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256291 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1256291.

It is not an unprimeable number, because it can be changed into a prime (1256201) 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, 5996 + ... + 6201.

It is an arithmetic number, because the mean of its divisors is an integer number (317148).

2^1256291 is an apocalyptic number.

1256291 is a deficient number, since it is larger than the sum of its proper divisors (12301).

1256291 is a wasteful number, since it uses less digits than its factorization.

1256291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12300.

The product of its digits is 1080, while the sum is 26.

The square root of 1256291 is about 1120.8438785130. The cubic root of 1256291 is about 107.9021461624.

The spelling of 1256291 in words is "one million, two hundred fifty-six thousand, two hundred ninety-one".