261225023 has 4 divisors (see below), whose sum is σ = 261392040. Its totient is φ = 261058008.

The previous prime is 261225001. The next prime is 261225031. The reversal of 261225023 is 320522162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261225023 - 2¹⁴ = 261208639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261225023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261227023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81140 + ... + 84297.

It is an arithmetic number, because the mean of its divisors is an integer number (65348010).

Almost surely, 2^261225023 is an apocalyptic number.

261225023 is a deficient number, since it is larger than the sum of its proper divisors (167017).

261225023 is a wasteful number, since it uses less digits than its factorization.

261225023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167016.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 261225023 is about 16162.4572079867. The cubic root of 261225023 is about 639.2512589865.

Adding to 261225023 its reverse (320522162), we get a palindrome (581747185).

The spelling of 261225023 in words is "two hundred sixty-one million, two hundred twenty-five thousand, twenty-three".