1261333264 has 20 divisors (see below), whose sum is σ = 2452477456. Its totient is φ = 628435872.

The previous prime is 1261333243. The next prime is 1261333277. The reversal of 1261333264 is 4623331621.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134754 + ... + 143809.

Almost surely, 2^1261333264 is an apocalyptic number.

It is an amenable number.

1261333264 is a deficient number, since it is larger than the sum of its proper divisors (1191144192).

1261333264 is a wasteful number, since it uses less digits than its factorization.

1261333264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278854 (or 278848 counting only the distinct ones).

The product of its digits is 15552, while the sum is 31.

The square root of 1261333264 is about 35515.2539622062. The cubic root of 1261333264 is about 1080.4631255625.

Adding to 1261333264 its reverse (4623331621), we get a palindrome (5884664885).

The spelling of 1261333264 in words is "one billion, two hundred sixty-one million, three hundred thirty-three thousand, two hundred sixty-four".