261838925 has 6 divisors (see below), whose sum is σ = 324680298. Its totient is φ = 209471120.

The previous prime is 261838897. The next prime is 261838957. The reversal of 261838925 is 529838162.

It can be written as a sum of positive squares in 3 ways, for example, as 44983849 + 216855076 = 6707^2 + 14726^2 .

It is not a de Polignac number, because 261838925 - 2⁶ = 261838861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5236754 + ... + 5236803.

It is an arithmetic number, because the mean of its divisors is an integer number (54113383).

Almost surely, 2^261838925 is an apocalyptic number.

261838925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261838925 is a deficient number, since it is larger than the sum of its proper divisors (62841373).

261838925 is a wasteful number, since it uses less digits than its factorization.

261838925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10473567 (or 10473562 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 261838925 is about 16181.4376678959. The cubic root of 261838925 is about 639.7516329572.

The spelling of 261838925 in words is "two hundred sixty-one million, eight hundred thirty-eight thousand, nine hundred twenty-five".