1261530276 has 36 divisors (see below), whose sum is σ = 3048597552. Its totient is φ = 406006496.

The previous prime is 1261530253. The next prime is 1261530287. The reversal of 1261530276 is 6720351621.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52410 + ... + 72593.

Almost surely, 2^1261530276 is an apocalyptic number.

It is an amenable number.

1261530276 is an abundant number, since it is smaller than the sum of its proper divisors (1787067276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261530276 is a wasteful number, since it uses less digits than its factorization.

1261530276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125068 (or 125037 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 1261530276 is about 35518.0274790141. The cubic root of 1261530276 is about 1080.5193763900.

Adding to 1261530276 its reverse (6720351621), we get a palindrome (7981881897).

The spelling of 1261530276 in words is "one billion, two hundred sixty-one million, five hundred thirty thousand, two hundred seventy-six".