1256648135 has 4 divisors (see below), whose sum is σ = 1507977768. Its totient is φ = 1005318504.

The previous prime is 1256648117. The next prime is 1256648153. The reversal of 1256648135 is 5318466521.

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 (1256648117) and next prime (1256648153).

It is a cyclic number.

It is not a de Polignac number, because 1256648135 - 2⁸ = 1256647879 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1256648092 and 1256648101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125664809 + ... + 125664818.

It is an arithmetic number, because the mean of its divisors is an integer number (376994442).

Almost surely, 2^1256648135 is an apocalyptic number.

1256648135 is a deficient number, since it is larger than the sum of its proper divisors (251329633).

1256648135 is an equidigital number, since it uses as much as digits as its factorization.

1256648135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251329632.

The product of its digits is 172800, while the sum is 41.

The square root of 1256648135 is about 35449.2332075039. The cubic root of 1256648135 is about 1079.1236990358.

The spelling of 1256648135 in words is "one billion, two hundred fifty-six million, six hundred forty-eight thousand, one hundred thirty-five".