255319261 has 2 divisors, whose sum is σ = 255319262. Its totient is φ = 255319260.

The previous prime is 255319249. The next prime is 255319291. The reversal of 255319261 is 162913552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230128900 + 25190361 = 15170^2 + 5019^2 .

It is a cyclic number.

It is not a de Polignac number, because 255319261 - 2¹⁹ = 254794973 is a prime.

It is a super-2 number, since 2×255319261² = 130375850075172242, which contains 22 as substring.

It is equal to p_13954228 and since 255319261 and 13954228 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255319241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127659630 + 127659631.

It is an arithmetic number, because the mean of its divisors is an integer number (127659631).

Almost surely, 2^255319261 is an apocalyptic number.

It is an amenable number.

255319261 is a deficient number, since it is larger than the sum of its proper divisors (1).

255319261 is an equidigital number, since it uses as much as digits as its factorization.

255319261 is an evil number, because the sum of its binary digits is even.

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

The square root of 255319261 is about 15978.7127453997. The cubic root of 255319261 is about 634.3971056579.

The spelling of 255319261 in words is "two hundred fifty-five million, three hundred nineteen thousand, two hundred sixty-one".