256540373 has 2 divisors, whose sum is σ = 256540374. Its totient is φ = 256540372.

The previous prime is 256540357. The next prime is 256540423. The reversal of 256540373 is 373045652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173238244 + 83302129 = 13162^2 + 9127^2 .

It is a cyclic number.

It is not a de Polignac number, because 256540373 - 2⁴ = 256540357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256540343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128270186 + 128270187.

It is an arithmetic number, because the mean of its divisors is an integer number (128270187).

Almost surely, 2^256540373 is an apocalyptic number.

It is an amenable number.

256540373 is a deficient number, since it is larger than the sum of its proper divisors (1).

256540373 is an equidigital number, since it uses as much as digits as its factorization.

256540373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 35.

The square root of 256540373 is about 16016.8777544189. The cubic root of 256540373 is about 635.4068717384.

The spelling of 256540373 in words is "two hundred fifty-six million, five hundred forty thousand, three hundred seventy-three".