256219501 has 2 divisors, whose sum is σ = 256219502. Its totient is φ = 256219500.

The previous prime is 256219493. The next prime is 256219531. The reversal of 256219501 is 105912652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225150025 + 31069476 = 15005^2 + 5574^2 .

It is a cyclic number.

It is not a de Polignac number, because 256219501 - 2³ = 256219493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256219531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128109750 + 128109751.

It is an arithmetic number, because the mean of its divisors is an integer number (128109751).

Almost surely, 2^256219501 is an apocalyptic number.

It is an amenable number.

256219501 is a deficient number, since it is larger than the sum of its proper divisors (1).

256219501 is an equidigital number, since it uses as much as digits as its factorization.

256219501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 256219501 is about 16006.8579365221. The cubic root of 256219501 is about 635.1418460892.

The spelling of 256219501 in words is "two hundred fifty-six million, two hundred nineteen thousand, five hundred one".