261331250 has 24 divisors (see below), whose sum is σ = 489976452. Its totient is φ = 104530000.

The previous prime is 261331223. The next prime is 261331261. The reversal of 261331250 is 52133162.

It can be written as a sum of positive squares in 6 ways, for example, as 77810041 + 183521209 = 8821^2 + 13547^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14657 + ... + 27156.

Almost surely, 2^261331250 is an apocalyptic number.

261331250 is a deficient number, since it is larger than the sum of its proper divisors (228645202).

261331250 is an frugal number, since it uses more digits than its factorization.

261331250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41840 (or 41820 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 261331250 is about 16165.7431007671. The cubic root of 261331250 is about 639.3378976249.

The spelling of 261331250 in words is "two hundred sixty-one million, three hundred thirty-one thousand, two hundred fifty".