261040530 has 32 divisors (see below), whose sum is σ = 641070144. Its totient is φ = 67991616.

The previous prime is 261040523. The next prime is 261040567. The reversal of 261040530 is 35040162.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 261040497 and 261040506.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99889 + ... + 102468.

It is an arithmetic number, because the mean of its divisors is an integer number (20033442).

Almost surely, 2^261040530 is an apocalyptic number.

261040530 is an abundant number, since it is smaller than the sum of its proper divisors (380029614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261040530 is a wasteful number, since it uses less digits than its factorization.

261040530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202410.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 261040530 is about 16156.7487447197. The cubic root of 261040530 is about 639.1007308366.

Adding to 261040530 its reverse (35040162), we get a palindrome (296080692).

The spelling of 261040530 in words is "two hundred sixty-one million, forty thousand, five hundred thirty".