261135507 has 4 divisors (see below), whose sum is σ = 348180680. Its totient is φ = 174090336.

The previous prime is 261135503. The next prime is 261135509. The reversal of 261135507 is 705531162.

261135507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 261135507 - 2² = 261135503 is a prime.

It is a super-2 number, since 2×261135507² = 136383506032294098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261135503) 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, 43522582 + ... + 43522587.

It is an arithmetic number, because the mean of its divisors is an integer number (87045170).

Almost surely, 2^261135507 is an apocalyptic number.

261135507 is a deficient number, since it is larger than the sum of its proper divisors (87045173).

261135507 is an equidigital number, since it uses as much as digits as its factorization.

261135507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87045172.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 261135507 is about 16159.6877135667. The cubic root of 261135507 is about 639.1782315857.

Adding to 261135507 its reverse (705531162), we get a palindrome (966666669).

The spelling of 261135507 in words is "two hundred sixty-one million, one hundred thirty-five thousand, five hundred seven".