261532136 has 16 divisors (see below), whose sum is σ = 497091300. Its totient is φ = 128974464.

The previous prime is 261532133. The next prime is 261532147. The reversal of 261532136 is 631235162.

It can be written as a sum of positive squares in 2 ways, for example, as 249324100 + 12208036 = 15790^2 + 3494^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261532099 and 261532108.

It is not an unprimeable number, because it can be changed into a prime (261532133) 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, 223331 + ... + 224498.

Almost surely, 2^261532136 is an apocalyptic number.

It is an amenable number.

261532136 is a deficient number, since it is larger than the sum of its proper divisors (235559164).

261532136 is a wasteful number, since it uses less digits than its factorization.

261532136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447908 (or 447904 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 261532136 is about 16171.9552312019. The cubic root of 261532136 is about 639.5016758920.

Adding to 261532136 its reverse (631235162), we get a palindrome (892767298).

The spelling of 261532136 in words is "two hundred sixty-one million, five hundred thirty-two thousand, one hundred thirty-six".