261254661 has 8 divisors (see below), whose sum is σ = 348511104. Its totient is φ = 174084000.

The previous prime is 261254647. The next prime is 261254671. The reversal of 261254661 is 166452162.

261254661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261254661 - 2⁶ = 261254597 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261254611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13965 + ... + 26786.

It is an arithmetic number, because the mean of its divisors is an integer number (43563888).

Almost surely, 2^261254661 is an apocalyptic number.

It is an amenable number.

261254661 is a deficient number, since it is larger than the sum of its proper divisors (87256443).

261254661 is a wasteful number, since it uses less digits than its factorization.

261254661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42891.

The product of its digits is 17280, while the sum is 33.

The square root of 261254661 is about 16163.3740598923. The cubic root of 261254661 is about 639.2754340727.

The spelling of 261254661 in words is "two hundred sixty-one million, two hundred fifty-four thousand, six hundred sixty-one".