261513232 has 20 divisors (see below), whose sum is σ = 507418540. Its totient is φ = 130566528.

The previous prime is 261513209. The next prime is 261513233. The reversal of 261513232 is 232315162.

It can be written as a sum of positive squares in 2 ways, for example, as 113550336 + 147962896 = 10656^2 + 12164^2 .

It is a super-2 number, since 2×261513232² = 136778341022171648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261513197 and 261513206.

It is not an unprimeable number, because it can be changed into a prime (261513233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183 + ... + 22870.

It is an arithmetic number, because the mean of its divisors is an integer number (25370927).

Almost surely, 2^261513232 is an apocalyptic number.

It is an amenable number.

261513232 is a deficient number, since it is larger than the sum of its proper divisors (245905308).

261513232 is a wasteful number, since it uses less digits than its factorization.

261513232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23770 (or 23764 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 261513232 is about 16171.3707520420. The cubic root of 261513232 is about 639.4862674210.

Adding to 261513232 its reverse (232315162), we get a palindrome (493828394).

The spelling of 261513232 in words is "two hundred sixty-one million, five hundred thirteen thousand, two hundred thirty-two".