256238545 has 4 divisors (see below), whose sum is σ = 307486260. Its totient is φ = 204990832.

The previous prime is 256238539. The next prime is 256238597. The reversal of 256238545 is 545832652.

It is a happy number.

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 192765456 + 63473089 = 13884^2 + 7967^2 .

It is a cyclic number.

It is not a de Polignac number, because 256238545 - 2³ = 256238537 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 256238498 and 256238507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25623850 + ... + 25623859.

It is an arithmetic number, because the mean of its divisors is an integer number (76871565).

Almost surely, 2^256238545 is an apocalyptic number.

It is an amenable number.

256238545 is a deficient number, since it is larger than the sum of its proper divisors (51247715).

256238545 is an equidigital number, since it uses as much as digits as its factorization.

256238545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51247714.

The product of its digits is 288000, while the sum is 40.

The square root of 256238545 is about 16007.4527954950. The cubic root of 256238545 is about 635.1575817398.

The spelling of 256238545 in words is "two hundred fifty-six million, two hundred thirty-eight thousand, five hundred forty-five".