261499044 has 12 divisors (see below), whose sum is σ = 610164464. Its totient is φ = 87166344.

The previous prime is 261499037. The next prime is 261499081. The reversal of 261499044 is 440994162.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 261498993 and 261499011.

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 3 ways as a sum of consecutive naturals, for example, 10895782 + ... + 10895805.

Almost surely, 2^261499044 is an apocalyptic number.

It is an amenable number.

261499044 is an abundant number, since it is smaller than the sum of its proper divisors (348665420).

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

261499044 is a wasteful number, since it uses less digits than its factorization.

261499044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21791594 (or 21791592 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 261499044 is about 16170.9320696118. The cubic root of 261499044 is about 639.4747024291.

The spelling of 261499044 in words is "two hundred sixty-one million, four hundred ninety-nine thousand, forty-four".