261635467 has 4 divisors (see below), whose sum is σ = 262758600. Its totient is φ = 260512336.

The previous prime is 261635461. The next prime is 261635471. The reversal of 261635467 is 764536162.

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 261635467 - 2¹⁵ = 261602699 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261635461) 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, 561217 + ... + 561682.

It is an arithmetic number, because the mean of its divisors is an integer number (65689650).

Almost surely, 2^261635467 is an apocalyptic number.

261635467 is a deficient number, since it is larger than the sum of its proper divisors (1123133).

261635467 is a wasteful number, since it uses less digits than its factorization.

261635467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123132.

The product of its digits is 181440, while the sum is 40.

The square root of 261635467 is about 16175.1496747325. The cubic root of 261635467 is about 639.5858868903.

It can be divided in two parts, 2616 and 35467, that added together give a palindrome (38083).

The spelling of 261635467 in words is "two hundred sixty-one million, six hundred thirty-five thousand, four hundred sixty-seven".