261530925 has 24 divisors (see below), whose sum is σ = 437617824. Its totient is φ = 137799360.

The previous prime is 261530917. The next prime is 261530939. The reversal of 261530925 is 529035162.

It is not a de Polignac number, because 261530925 - 2³ = 261530917 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14782 + ... + 27231.

It is an arithmetic number, because the mean of its divisors is an integer number (18234076).

Almost surely, 2^261530925 is an apocalyptic number.

261530925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261530925 is a deficient number, since it is larger than the sum of its proper divisors (176086899).

261530925 is a wasteful number, since it uses less digits than its factorization.

261530925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42109 (or 42104 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 261530925 is about 16171.9177897985. The cubic root of 261530925 is about 639.5006888396.

The spelling of 261530925 in words is "two hundred sixty-one million, five hundred thirty thousand, nine hundred twenty-five".