256603115 has 8 divisors (see below), whose sum is σ = 309704688. Its totient is φ = 204095200.

The previous prime is 256603093. The next prime is 256603129. The reversal of 256603115 is 511306652.

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

It is not a de Polignac number, because 256603115 - 2¹² = 256599019 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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147461 + ... + 149190.

It is an arithmetic number, because the mean of its divisors is an integer number (38713086).

Almost surely, 2^256603115 is an apocalyptic number.

256603115 is a deficient number, since it is larger than the sum of its proper divisors (53101573).

256603115 is a wasteful number, since it uses less digits than its factorization.

256603115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296829.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 256603115 is about 16018.8362561080. The cubic root of 256603115 is about 635.4586679370.

Adding to 256603115 its reverse (511306652), we get a palindrome (767909767).

The spelling of 256603115 in words is "two hundred fifty-six million, six hundred three thousand, one hundred fifteen".