1256122145 has 8 divisors (see below), whose sum is σ = 1507538304. Its totient is φ = 1004769904.

The previous prime is 1256122117. The next prime is 1256122159. The reversal of 1256122145 is 5412216521.

1256122145 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1256122145 - 2¹⁰ = 1256121121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 60842 + ... + 78828.

It is an arithmetic number, because the mean of its divisors is an integer number (188442288).

Almost surely, 2^1256122145 is an apocalyptic number.

It is an amenable number.

1256122145 is a deficient number, since it is larger than the sum of its proper divisors (251416159).

1256122145 is a wasteful number, since it uses less digits than its factorization.

1256122145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31959.

The product of its digits is 4800, while the sum is 29.

The square root of 1256122145 is about 35441.8135117265. The cubic root of 1256122145 is about 1078.9731165800.

Adding to 1256122145 its reverse (5412216521), we get a palindrome (6668338666).

The spelling of 1256122145 in words is "one billion, two hundred fifty-six million, one hundred twenty-two thousand, one hundred forty-five".