261212725 has 24 divisors (see below), whose sum is σ = 339746112. Its totient is φ = 198844800.

The previous prime is 261212717. The next prime is 261212737. The reversal of 261212725 is 527212162.

It is not a de Polignac number, because 261212725 - 2³ = 261212717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261212693 and 261212702.

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, 120249 + ... + 122401.

It is an arithmetic number, because the mean of its divisors is an integer number (14156088).

Almost surely, 2^261212725 is an apocalyptic number.

261212725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261212725 is a deficient number, since it is larger than the sum of its proper divisors (78533387).

261212725 is a wasteful number, since it uses less digits than its factorization.

261212725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2397 (or 2392 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 261212725 is about 16162.0767539323. The cubic root of 261212725 is about 639.2412272327.

Adding to 261212725 its reverse (527212162), we get a palindrome (788424887).

The spelling of 261212725 in words is "two hundred sixty-one million, two hundred twelve thousand, seven hundred twenty-five".