1256830741 has 4 divisors (see below), whose sum is σ = 1256912172. Its totient is φ = 1256749312.

The previous prime is 1256830733. The next prime is 1256830759. The reversal of 1256830741 is 1470386521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1016270641 + 240560100 = 31879^2 + 15510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256830741 - 2³ = 1256830733 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 1256830741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256830721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9676 + ... + 51061.

It is an arithmetic number, because the mean of its divisors is an integer number (314228043).

Almost surely, 2^1256830741 is an apocalyptic number.

It is an amenable number.

1256830741 is a deficient number, since it is larger than the sum of its proper divisors (81431).

1256830741 is an equidigital number, since it uses as much as digits as its factorization.

1256830741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81430.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 1256830741 is about 35451.8087126736. The cubic root of 1256830741 is about 1079.1759663631.

The spelling of 1256830741 in words is "one billion, two hundred fifty-six million, eight hundred thirty thousand, seven hundred forty-one".