261132633 has 16 divisors (see below), whose sum is σ = 390855360. Its totient is φ = 172291968.

The previous prime is 261132587. The next prime is 261132647. The reversal of 261132633 is 336231162.

It is a happy number.

261132633 is a `hidden beast` number, since 26 + 1 + 1 + 3 + 2 + 633 = 666.

It is not a de Polignac number, because 261132633 - 2¹⁰ = 261131609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 261132597 and 261132606.

It is not an unprimeable number, because it can be changed into a prime (261130633) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 47235 + ... + 52472.

It is an arithmetic number, because the mean of its divisors is an integer number (24428460).

Almost surely, 2^261132633 is an apocalyptic number.

It is an amenable number.

261132633 is a deficient number, since it is larger than the sum of its proper divisors (129722727).

261132633 is an equidigital number, since it uses as much as digits as its factorization.

261132633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99813 (or 99807 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 261132633 is about 16159.5987883363. The cubic root of 261132633 is about 639.1758866921.

Adding to 261132633 its reverse (336231162), we get a palindrome (597363795).

The spelling of 261132633 in words is "two hundred sixty-one million, one hundred thirty-two thousand, six hundred thirty-three".