1256046145 has 4 divisors (see below), whose sum is σ = 1507255380. Its totient is φ = 1004836912.

The previous prime is 1256046133. The next prime is 1256046149. The reversal of 1256046145 is 5416406521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 912462849 + 343583296 = 30207^2 + 18536^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256046145 - 2¹³ = 1256037953 is a prime.

It is a super-2 number, since 2×1256046145² = 3155303836738722050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1256046145.

It is not an unprimeable number, because it can be changed into a prime (1256046149) 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, 125604610 + ... + 125604619.

It is an arithmetic number, because the mean of its divisors is an integer number (376813845).

Almost surely, 2^1256046145 is an apocalyptic number.

It is an amenable number.

1256046145 is a deficient number, since it is larger than the sum of its proper divisors (251209235).

1256046145 is an equidigital number, since it uses as much as digits as its factorization.

1256046145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251209234.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 1256046145 is about 35440.7413156102. The cubic root of 1256046145 is about 1078.9513555299.

The spelling of 1256046145 in words is "one billion, two hundred fifty-six million, forty-six thousand, one hundred forty-five".