261425541 has 32 divisors (see below), whose sum is σ = 418400640. Its totient is φ = 143437824.

The previous prime is 261425537. The next prime is 261425557. The reversal of 261425541 is 145524162.

It is not a de Polignac number, because 261425541 - 2² = 261425537 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261425499 and 261425508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261425341) 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 31 ways as a sum of consecutive naturals, for example, 2221 + ... + 22973.

It is an arithmetic number, because the mean of its divisors is an integer number (13075020).

Almost surely, 2^261425541 is an apocalyptic number.

It is an amenable number.

261425541 is a deficient number, since it is larger than the sum of its proper divisors (156975099).

261425541 is a wasteful number, since it uses less digits than its factorization.

261425541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20805.

The product of its digits is 9600, while the sum is 30.

The square root of 261425541 is about 16168.6592208507. The cubic root of 261425541 is about 639.4147816062.

The spelling of 261425541 in words is "two hundred sixty-one million, four hundred twenty-five thousand, five hundred forty-one".