256003001 has 2 divisors, whose sum is σ = 256003002. Its totient is φ = 256003000.

The previous prime is 256002931. The next prime is 256003003. The reversal of 256003001 is 100300652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216060601 + 39942400 = 14699^2 + 6320^2 .

It is a cyclic number.

It is not a de Polignac number, because 256003001 - 2¹⁸ = 255740857 is a prime.

It is a super-3 number, since 3×256003001³ (a number of 26 digits) contains 333 as substring.

Together with 256003003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256003003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128001500 + 128001501.

It is an arithmetic number, because the mean of its divisors is an integer number (128001501).

Almost surely, 2^256003001 is an apocalyptic number.

It is an amenable number.

256003001 is a deficient number, since it is larger than the sum of its proper divisors (1).

256003001 is an equidigital number, since it uses as much as digits as its factorization.

256003001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 256003001 is about 16000.0937809752. The cubic root of 256003001 is about 634.9629019185.

Adding to 256003001 its reverse (100300652), we get a palindrome (356303653).

The spelling of 256003001 in words is "two hundred fifty-six million, three thousand, one".