256509097 has 8 divisors (see below), whose sum is σ = 285152000. Its totient is φ = 229139280.

The previous prime is 256509091. The next prime is 256509103. The reversal of 256509097 is 790905652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256509091) and next prime (256509103).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256509097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256509091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317847 + ... + 318652.

It is an arithmetic number, because the mean of its divisors is an integer number (35644000).

Almost surely, 2^256509097 is an apocalyptic number.

It is an amenable number.

256509097 is a deficient number, since it is larger than the sum of its proper divisors (28642903).

256509097 is a wasteful number, since it uses less digits than its factorization.

256509097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636543.

The product of its (nonzero) digits is 170100, while the sum is 43.

The square root of 256509097 is about 16015.9013795665. The cubic root of 256509097 is about 635.3810489115.

The spelling of 256509097 in words is "two hundred fifty-six million, five hundred nine thousand, ninety-seven".