256219531 has 2 divisors, whose sum is σ = 256219532. Its totient is φ = 256219530.

The previous prime is 256219501. The next prime is 256219547. The reversal of 256219531 is 135912652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256219531 - 2¹¹ = 256217483 is a prime.

It is a super-2 number, since 2×256219531² = 131296896131719922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256219501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128109765 + 128109766.

It is an arithmetic number, because the mean of its divisors is an integer number (128109766).

Almost surely, 2^256219531 is an apocalyptic number.

256219531 is a deficient number, since it is larger than the sum of its proper divisors (1).

256219531 is an equidigital number, since it uses as much as digits as its factorization.

256219531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 34.

The square root of 256219531 is about 16006.8588736204. The cubic root of 256219531 is about 635.1418708782.

The spelling of 256219531 in words is "two hundred fifty-six million, two hundred nineteen thousand, five hundred thirty-one".