256250387 has 2 divisors, whose sum is σ = 256250388. Its totient is φ = 256250386.

The previous prime is 256250381. The next prime is 256250443. The reversal of 256250387 is 783052652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256250387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256250387.

It is not a weakly prime, because it can be changed into another prime (256250381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128125193 + 128125194.

It is an arithmetic number, because the mean of its divisors is an integer number (128125194).

Almost surely, 2^256250387 is an apocalyptic number.

256250387 is a deficient number, since it is larger than the sum of its proper divisors (1).

256250387 is an equidigital number, since it uses as much as digits as its factorization.

256250387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 256250387 is about 16007.8226814267. The cubic root of 256250387 is about 635.1673661385.

The spelling of 256250387 in words is "two hundred fifty-six million, two hundred fifty thousand, three hundred eighty-seven".