261223524 has 18 divisors (see below), whose sum is σ = 660315110. Its totient is φ = 87074496.

The previous prime is 261223511. The next prime is 261223541. The reversal of 261223524 is 425322162.

It is a happy number.

261223524 is a `hidden beast` number, since 2 + 612 + 23 + 5 + 24 = 666.

261223524 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 232257600 + 28965924 = 15240^2 + 5382^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3628069 + ... + 3628140.

Almost surely, 2^261223524 is an apocalyptic number.

It is an amenable number.

261223524 is an abundant number, since it is smaller than the sum of its proper divisors (399091586).

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

261223524 is a wasteful number, since it uses less digits than its factorization.

261223524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7256219 (or 7256214 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 261223524 is about 16162.4108350209. The cubic root of 261223524 is about 639.2500362355.

Adding to 261223524 its reverse (425322162), we get a palindrome (686545686).

It can be divided in two parts, 26122 and 3524, that added together give a triangular number (29646 = T₂₄₃).

The spelling of 261223524 in words is "two hundred sixty-one million, two hundred twenty-three thousand, five hundred twenty-four".