268510861 has 2 divisors, whose sum is σ = 268510862. Its totient is φ = 268510860.

The previous prime is 268510849. The next prime is 268510867. The reversal of 268510861 is 168015862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256608361 + 11902500 = 16019^2 + 3450^2 .

It is a cyclic number.

It is not a de Polignac number, because 268510861 - 2¹³ = 268502669 is a prime.

It is a super-2 number, since 2×268510861² = 144196164949922642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 268510861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268510867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134255430 + 134255431.

It is an arithmetic number, because the mean of its divisors is an integer number (134255431).

Almost surely, 2^268510861 is an apocalyptic number.

It is an amenable number.

268510861 is a deficient number, since it is larger than the sum of its proper divisors (1).

268510861 is an equidigital number, since it uses as much as digits as its factorization.

268510861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 268510861 is about 16386.3010163978. The cubic root of 268510861 is about 645.1399740283.

The spelling of 268510861 in words is "two hundred sixty-eight million, five hundred ten thousand, eight hundred sixty-one".