261443152 has 10 divisors (see below), whose sum is σ = 506546138. Its totient is φ = 130721568.

The previous prime is 261443141. The next prime is 261443167. The reversal of 261443152 is 251344162.

261443152 is digitally balanced in base 2, 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., 140090896 + 121352256 = 11836^2 + 11016^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261443152.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8170083 + ... + 8170114.

Almost surely, 2^261443152 is an apocalyptic number.

It is an amenable number.

261443152 is a deficient number, since it is larger than the sum of its proper divisors (245102986).

261443152 is a wasteful number, since it uses less digits than its factorization.

261443152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16340205 (or 16340199 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 261443152 is about 16169.2038146595. The cubic root of 261443152 is about 639.4291393985.

The spelling of 261443152 in words is "two hundred sixty-one million, four hundred forty-three thousand, one hundred fifty-two".