1268588261 has 4 divisors (see below), whose sum is σ = 1269124332. Its totient is φ = 1268052192.

The previous prime is 1268588227. The next prime is 1268588281. The reversal of 1268588261 is 1628858621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 533148100 + 735440161 = 23090^2 + 27119^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268588261 - 2⁶ = 1268588197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268588281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264470 + ... + 269223.

It is an arithmetic number, because the mean of its divisors is an integer number (317281083).

Almost surely, 2^1268588261 is an apocalyptic number.

It is an amenable number.

1268588261 is a deficient number, since it is larger than the sum of its proper divisors (536071).

1268588261 is an equidigital number, since it uses as much as digits as its factorization.

1268588261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536070.

The product of its digits is 368640, while the sum is 47.

The square root of 1268588261 is about 35617.2466791020. The cubic root of 1268588261 is about 1082.5307196149.

The spelling of 1268588261 in words is "one billion, two hundred sixty-eight million, five hundred eighty-eight thousand, two hundred sixty-one".