261625441 has 16 divisors (see below), whose sum is σ = 327748608. Its totient is φ = 202885200.

The previous prime is 261625433. The next prime is 261625447. The reversal of 261625441 is 144526162.

It is a happy number.

It is not a de Polignac number, because 261625441 - 2³ = 261625433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261625447) 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 15 ways as a sum of consecutive naturals, for example, 8196 + ... + 24298.

It is an arithmetic number, because the mean of its divisors is an integer number (20484288).

Almost surely, 2^261625441 is an apocalyptic number.

It is an amenable number.

261625441 is a deficient number, since it is larger than the sum of its proper divisors (66123167).

261625441 is a wasteful number, since it uses less digits than its factorization.

261625441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16332.

The product of its digits is 11520, while the sum is 31.

The square root of 261625441 is about 16174.8397519110. The cubic root of 261625441 is about 639.5777170372.

The spelling of 261625441 in words is "two hundred sixty-one million, six hundred twenty-five thousand, four hundred forty-one".