261254401 has 4 divisors (see below), whose sum is σ = 272613312. Its totient is φ = 249895492.

The previous prime is 261254353. The next prime is 261254407. The reversal of 261254401 is 104452162.

It is a happy number.

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 261254401 - 2¹¹ = 261252353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261254407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5679421 + ... + 5679466.

It is an arithmetic number, because the mean of its divisors is an integer number (68153328).

Almost surely, 2^261254401 is an apocalyptic number.

It is an amenable number.

261254401 is a deficient number, since it is larger than the sum of its proper divisors (11358911).

261254401 is a wasteful number, since it uses less digits than its factorization.

261254401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11358910.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 261254401 is about 16163.3660170151. The cubic root of 261254401 is about 639.2752220041.

The spelling of 261254401 in words is "two hundred sixty-one million, two hundred fifty-four thousand, four hundred one".