1261315236 has 24 divisors (see below), whose sum is σ = 2952540864. Its totient is φ = 419085280.

The previous prime is 1261315217. The next prime is 1261315261. The reversal of 1261315236 is 6325131621.

It is a super-2 number, since 2×1261315236² = 3181832249131471392, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165255 + ... + 172718.

It is an arithmetic number, because the mean of its divisors is an integer number (123022536).

Almost surely, 2^1261315236 is an apocalyptic number.

It is an amenable number.

1261315236 is an abundant number, since it is smaller than the sum of its proper divisors (1691225628).

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

1261315236 is a wasteful number, since it uses less digits than its factorization.

1261315236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338291 (or 338289 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 1261315236 is about 35515.0001548641. Note that the first 3 decimals coincide. The cubic root of 1261315236 is about 1080.4579779190.

Adding to 1261315236 its reverse (6325131621), we get a palindrome (7586446857).

The spelling of 1261315236 in words is "one billion, two hundred sixty-one million, three hundred fifteen thousand, two hundred thirty-six".