256240499 has 2 divisors, whose sum is σ = 256240500. Its totient is φ = 256240498.

The previous prime is 256240489. The next prime is 256240511. The reversal of 256240499 is 994042652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256240499 is a prime.

It is a super-3 number, since 3×256240499³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (256240489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128120249 + 128120250.

It is an arithmetic number, because the mean of its divisors is an integer number (128120250).

Almost surely, 2^256240499 is an apocalyptic number.

256240499 is a deficient number, since it is larger than the sum of its proper divisors (1).

256240499 is an equidigital number, since it uses as much as digits as its factorization.

256240499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 256240499 is about 16007.5138294490. The cubic root of 256240499 is about 635.1591962442.

The spelling of 256240499 in words is "two hundred fifty-six million, two hundred forty thousand, four hundred ninety-nine".