261445422 has 16 divisors (see below), whose sum is σ = 597589632. Its totient is φ = 74698680.

The previous prime is 261445403. The next prime is 261445427. The reversal of 261445422 is 224544162.

It is a self number, because there is not a number n which added to its sum of digits gives 261445422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261445427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3112404 + ... + 3112487.

It is an arithmetic number, because the mean of its divisors is an integer number (37349352).

Almost surely, 2^261445422 is an apocalyptic number.

261445422 is an abundant number, since it is smaller than the sum of its proper divisors (336144210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261445422 is a wasteful number, since it uses less digits than its factorization.

261445422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6224903.

The product of its digits is 15360, while the sum is 30.

The square root of 261445422 is about 16169.2740096765. The cubic root of 261445422 is about 639.4309900239.

Adding to 261445422 its reverse (224544162), we get a palindrome (485989584).

The spelling of 261445422 in words is "two hundred sixty-one million, four hundred forty-five thousand, four hundred twenty-two".