1256313 has 4 divisors (see below), whose sum is σ = 1675088. Its totient is φ = 837540.

The previous prime is 1256303. The next prime is 1256323. The reversal of 1256313 is 3136521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3136521 = 3 ⋅1045507.

It is an interprime number because it is at equal distance from previous prime (1256303) and next prime (1256323).

It is not a de Polignac number, because 1256313 - 2⁹ = 1255801 is a prime.

It is a D-number.

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 1256313.

It is not an unprimeable number, because it can be changed into a prime (1256303) 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, 209383 + ... + 209388.

It is an arithmetic number, because the mean of its divisors is an integer number (418772).

2^1256313 is an apocalyptic number.

It is an amenable number.

1256313 is a deficient number, since it is larger than the sum of its proper divisors (418775).

1256313 is an equidigital number, since it uses as much as digits as its factorization.

1256313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418774.

The product of its digits is 540, while the sum is 21.

The square root of 1256313 is about 1120.8536925041. The cubic root of 1256313 is about 107.9027760147.

The spelling of 1256313 in words is "one million, two hundred fifty-six thousand, three hundred thirteen".