261231200 has 36 divisors (see below), whose sum is σ = 637732620. Its totient is φ = 104492160.

The previous prime is 261231193. The next prime is 261231233. The reversal of 261231200 is 2132162.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 162470 + ... + 164069.

It is an arithmetic number, because the mean of its divisors is an integer number (17714795).

Almost surely, 2^261231200 is an apocalyptic number.

261231200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261231200 is an abundant number, since it is smaller than the sum of its proper divisors (376501420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261231200 is a wasteful number, since it uses less digits than its factorization.

261231200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326559 (or 326546 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 261231200 is about 16162.6482978502. The cubic root of 261231200 is about 639.2562975848.

Adding to 261231200 its reverse (2132162), we get a palindrome (263363362).

The spelling of 261231200 in words is "two hundred sixty-one million, two hundred thirty-one thousand, two hundred".