261322241 has 4 divisors (see below), whose sum is σ = 261475632. Its totient is φ = 261168852.

The previous prime is 261322207. The next prime is 261322267. The reversal of 261322241 is 142223162.

It is a happy number.

261322241 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 261322241 - 2¹⁴ = 261305857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261322291) 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, 74111 + ... + 77556.

It is an arithmetic number, because the mean of its divisors is an integer number (65368908).

Almost surely, 2^261322241 is an apocalyptic number.

It is an amenable number.

261322241 is a deficient number, since it is larger than the sum of its proper divisors (153391).

261322241 is a wasteful number, since it uses less digits than its factorization.

261322241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153390.

The product of its digits is 1152, while the sum is 23.

The square root of 261322241 is about 16165.4644535813. The cubic root of 261322241 is about 639.3305508045.

The spelling of 261322241 in words is "two hundred sixty-one million, three hundred twenty-two thousand, two hundred forty-one".