256901143 has 2 divisors, whose sum is σ = 256901144. Its totient is φ = 256901142.

The previous prime is 256901063. The next prime is 256901153. The reversal of 256901143 is 341109652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256901143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256901153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128450571 + 128450572.

It is an arithmetic number, because the mean of its divisors is an integer number (128450572).

Almost surely, 2^256901143 is an apocalyptic number.

256901143 is a deficient number, since it is larger than the sum of its proper divisors (1).

256901143 is an equidigital number, since it uses as much as digits as its factorization.

256901143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 256901143 is about 16028.1359802068. The cubic root of 256901143 is about 635.7045875340.

The spelling of 256901143 in words is "two hundred fifty-six million, nine hundred one thousand, one hundred forty-three".