255531521309 has 2 divisors, whose sum is σ = 255531521310. Its totient is φ = 255531521308.

The previous prime is 255531521291. The next prime is 255531521339. The reversal of 255531521309 is 903125135552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247658508409 + 7873012900 = 497653^2 + 88730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255531521309 is a prime.

It is a super-3 number, since 3×255531521309³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255531521339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127765760654 + 127765760655.

It is an arithmetic number, because the mean of its divisors is an integer number (127765760655).

Almost surely, 2^255531521309 is an apocalyptic number.

It is an amenable number.

255531521309 is a deficient number, since it is larger than the sum of its proper divisors (1).

255531521309 is an equidigital number, since it uses as much as digits as its factorization.

255531521309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 202500, while the sum is 41.

The spelling of 255531521309 in words is "two hundred fifty-five billion, five hundred thirty-one million, five hundred twenty-one thousand, three hundred nine".