261133444 has 72 divisors (see below), whose sum is σ = 561883392. Its totient is φ = 104681280.

The previous prime is 261133417. The next prime is 261133459. The reversal of 261133444 is 444331162.

It is a super-2 number, since 2×261133444² = 136381351150602272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 302157 + ... + 303019.

It is an arithmetic number, because the mean of its divisors is an integer number (7803936).

Almost surely, 2^261133444 is an apocalyptic number.

It is an amenable number.

261133444 is an abundant number, since it is smaller than the sum of its proper divisors (300749948).

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

261133444 is a wasteful number, since it uses less digits than its factorization.

261133444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937 (or 912 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

The square root of 261133444 is about 16159.6238817616. The cubic root of 261133444 is about 639.1765483879.

The spelling of 261133444 in words is "two hundred sixty-one million, one hundred thirty-three thousand, four hundred forty-four".