256741145 has 8 divisors (see below), whose sum is σ = 309686856. Its totient is φ = 204327936.

The previous prime is 256741117. The next prime is 256741159. The reversal of 256741145 is 541147652.

It can be written as a sum of positive squares in 4 ways, for example, as 23629321 + 233111824 = 4861^2 + 15268^2 .

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 256741145 - 2⁶ = 256741081 is a prime.

It is a super-2 number, since 2×256741145² = 131832031071822050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132062 + ... + 133991.

It is an arithmetic number, because the mean of its divisors is an integer number (38710857).

Almost surely, 2^256741145 is an apocalyptic number.

It is an amenable number.

256741145 is a deficient number, since it is larger than the sum of its proper divisors (52945711).

256741145 is a wasteful number, since it uses less digits than its factorization.

256741145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266251.

The product of its digits is 33600, while the sum is 35.

The square root of 256741145 is about 16023.1440422908. The cubic root of 256741145 is about 635.5725878810.

Adding to 256741145 its reverse (541147652), we get a palindrome (797888797).

The spelling of 256741145 in words is "two hundred fifty-six million, seven hundred forty-one thousand, one hundred forty-five".