261432635 has 4 divisors (see below), whose sum is σ = 313719168. Its totient is φ = 209146104.

The previous prime is 261432631. The next prime is 261432667. The reversal of 261432635 is 536234162.

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

It is a cyclic number.

It is not a de Polignac number, because 261432635 - 2² = 261432631 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261432631) 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, 26143259 + ... + 26143268.

It is an arithmetic number, because the mean of its divisors is an integer number (78429792).

Almost surely, 2^261432635 is an apocalyptic number.

261432635 is a deficient number, since it is larger than the sum of its proper divisors (52286533).

261432635 is an equidigital number, since it uses as much as digits as its factorization.

261432635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52286532.

The product of its digits is 25920, while the sum is 32.

The square root of 261432635 is about 16168.8785943862. The cubic root of 261432635 is about 639.4205652383.

Adding to 261432635 its reverse (536234162), we get a palindrome (797666797).

The spelling of 261432635 in words is "two hundred sixty-one million, four hundred thirty-two thousand, six hundred thirty-five".