1261513233 has 12 divisors (see below), whose sum is σ = 1823852160. Its totient is φ = 840239736.

The previous prime is 1261513217. The next prime is 1261513241. The reversal of 1261513233 is 3323151621.

1261513233 is a `hidden beast` number, since 1 + 2 + 615 + 13 + 2 + 33 = 666.

It is not a de Polignac number, because 1261513233 - 2⁴ = 1261513217 is a prime.

It is a super-2 number, since 2×1261513233² = 3182831274068224578, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1261513197 and 1261513206.

It is not an unprimeable number, because it can be changed into a prime (1261513273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53613 + ... + 73466.

It is an arithmetic number, because the mean of its divisors is an integer number (151987680).

Almost surely, 2^1261513233 is an apocalyptic number.

It is an amenable number.

1261513233 is a deficient number, since it is larger than the sum of its proper divisors (562338927).

1261513233 is a wasteful number, since it uses less digits than its factorization.

1261513233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128188 (or 128185 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 1261513233 is about 35517.7875577857. The cubic root of 1261513233 is about 1080.5145105074.

Adding to 1261513233 its reverse (3323151621), we get a palindrome (4584664854).

The spelling of 1261513233 in words is "one billion, two hundred sixty-one million, five hundred thirteen thousand, two hundred thirty-three".