256711545 has 16 divisors (see below), whose sum is σ = 456376320. Its totient is φ = 136912752.

The previous prime is 256711541. The next prime is 256711547. The reversal of 256711545 is 545117652.

It is not a de Polignac number, because 256711545 - 2² = 256711541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256711541) 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 15 ways as a sum of consecutive naturals, for example, 950649 + ... + 950918.

It is an arithmetic number, because the mean of its divisors is an integer number (28523520).

Almost surely, 2^256711545 is an apocalyptic number.

It is an amenable number.

256711545 is a deficient number, since it is larger than the sum of its proper divisors (199664775).

256711545 is a wasteful number, since it uses less digits than its factorization.

256711545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901581 (or 1901575 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 256711545 is about 16022.2203517490. The cubic root of 256711545 is about 635.5481616291.

The spelling of 256711545 in words is "two hundred fifty-six million, seven hundred eleven thousand, five hundred forty-five".