261136264 has 8 divisors (see below), whose sum is σ = 489630510. Its totient is φ = 130568128.

The previous prime is 261136261. The next prime is 261136279. The reversal of 261136264 is 462631162.

261136264 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., 169780900 + 91355364 = 13030^2 + 9558^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (261136261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16321009 + ... + 16321024.

Almost surely, 2^261136264 is an apocalyptic number.

It is an amenable number.

261136264 is a deficient number, since it is larger than the sum of its proper divisors (228494246).

261136264 is a wasteful number, since it uses less digits than its factorization.

261136264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32642039 (or 32642035 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 261136264 is about 16159.7111360321. The cubic root of 261136264 is about 639.1788492184.

The spelling of 261136264 in words is "two hundred sixty-one million, one hundred thirty-six thousand, two hundred sixty-four".