261111632 has 20 divisors (see below), whose sum is σ = 507509556. Its totient is φ = 130141440.

The previous prime is 261111581. The next prime is 261111637. The reversal of 261111632 is 236111162.

261111632 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 2 ways, for example, as 33825856 + 227285776 = 5816^2 + 15076^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261111598 and 261111607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261111637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20669 + ... + 30812.

Almost surely, 2^261111632 is an apocalyptic number.

It is an amenable number.

261111632 is a deficient number, since it is larger than the sum of its proper divisors (246397924).

261111632 is a wasteful number, since it uses less digits than its factorization.

261111632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51806 (or 51800 counting only the distinct ones).

The product of its digits is 432, while the sum is 23.

The square root of 261111632 is about 16158.9489757224. The cubic root of 261111632 is about 639.1587514755.

Adding to 261111632 its reverse (236111162), we get a palindrome (497222794).

The spelling of 261111632 in words is "two hundred sixty-one million, one hundred eleven thousand, six hundred thirty-two".