256335137 has 4 divisors (see below), whose sum is σ = 269826480. Its totient is φ = 242843796.

The previous prime is 256335119. The next prime is 256335151. The reversal of 256335137 is 731533652.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256335137 - 2²⁰ = 255286561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256335097 and 256335106.

It is not an unprimeable number, because it can be changed into a prime (256385137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6745643 + ... + 6745680.

It is an arithmetic number, because the mean of its divisors is an integer number (67456620).

Almost surely, 2^256335137 is an apocalyptic number.

It is an amenable number.

256335137 is a deficient number, since it is larger than the sum of its proper divisors (13491343).

256335137 is a wasteful number, since it uses less digits than its factorization.

256335137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13491342.

The product of its digits is 56700, while the sum is 35.

The square root of 256335137 is about 16010.4696058548. The cubic root of 256335137 is about 635.2373816437.

Adding to 256335137 its reverse (731533652), we get a palindrome (987868789).

The spelling of 256335137 in words is "two hundred fifty-six million, three hundred thirty-five thousand, one hundred thirty-seven".