261523250 has 32 divisors (see below), whose sum is σ = 491871744. Its totient is φ = 104118000.

The previous prime is 261523237. The next prime is 261523261. The reversal of 261523250 is 52325162.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53405 + ... + 58095.

It is an arithmetic number, because the mean of its divisors is an integer number (15370992).

Almost surely, 2^261523250 is an apocalyptic number.

261523250 is a deficient number, since it is larger than the sum of its proper divisors (230348494).

261523250 is a wasteful number, since it uses less digits than its factorization.

261523250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4931 (or 4921 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 261523250 is about 16171.6804939994. The cubic root of 261523250 is about 639.4944330902.

The spelling of 261523250 in words is "two hundred sixty-one million, five hundred twenty-three thousand, two hundred fifty".