261004135 has 16 divisors (see below), whose sum is σ = 365256000. Its totient is φ = 178973088.

The previous prime is 261004103. The next prime is 261004151. The reversal of 261004135 is 531400162.

It is not a de Polignac number, because 261004135 - 2⁵ = 261004103 is a prime.

It is a congruent number.

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, 74380 + ... + 77809.

It is an arithmetic number, because the mean of its divisors is an integer number (22828500).

Almost surely, 2^261004135 is an apocalyptic number.

261004135 is a deficient number, since it is larger than the sum of its proper divisors (104251865).

261004135 is an equidigital number, since it uses as much as digits as its factorization.

261004135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152215 (or 152201 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 261004135 is about 16155.6223959339. The cubic root of 261004135 is about 639.0710277196.

Adding to 261004135 its reverse (531400162), we get a palindrome (792404297).

The spelling of 261004135 in words is "two hundred sixty-one million, four thousand, one hundred thirty-five".