261424361 has 4 divisors (see below), whose sum is σ = 285190224. Its totient is φ = 237658500.

The previous prime is 261424349. The next prime is 261424381. The reversal of 261424361 is 163424162.

261424361 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261424361 - 2⁶ = 261424297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261424381) 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, 11882915 + ... + 11882936.

It is an arithmetic number, because the mean of its divisors is an integer number (71297556).

Almost surely, 2^261424361 is an apocalyptic number.

It is an amenable number.

261424361 is a deficient number, since it is larger than the sum of its proper divisors (23765863).

261424361 is a wasteful number, since it uses less digits than its factorization.

261424361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23765862.

The product of its digits is 6912, while the sum is 29.

The square root of 261424361 is about 16168.6227304616. The cubic root of 261424361 is about 639.4138195597.

It can be divided in two parts, 26142 and 4361, that added together give a palindrome (30503).

The spelling of 261424361 in words is "two hundred sixty-one million, four hundred twenty-four thousand, three hundred sixty-one".