261236252 has 12 divisors (see below), whose sum is σ = 462950880. Its totient is φ = 128964576.

The previous prime is 261236233. The next prime is 261236273. The reversal of 261236252 is 252632162.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 413033 + ... + 413664.

It is an arithmetic number, because the mean of its divisors is an integer number (38579240).

Almost surely, 2^261236252 is an apocalyptic number.

It is an amenable number.

261236252 is a deficient number, since it is larger than the sum of its proper divisors (201714628).

261236252 is a wasteful number, since it uses less digits than its factorization.

261236252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826780 (or 826778 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 261236252 is about 16162.8045833636. The cubic root of 261236252 is about 639.2604184581.

The spelling of 261236252 in words is "two hundred sixty-one million, two hundred thirty-six thousand, two hundred fifty-two".