261652250 has 32 divisors (see below), whose sum is σ = 490810320. Its totient is φ = 104448000.

The previous prime is 261652247. The next prime is 261652273. The reversal of 261652250 is 52256162.

It can be written as a sum of positive squares in 8 ways, for example, as 797449 + 260854801 = 893^2 + 16151^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191570 + ... + 192930.

Almost surely, 2^261652250 is an apocalyptic number.

261652250 is a deficient number, since it is larger than the sum of its proper divisors (229158070).

261652250 is a wasteful number, since it uses less digits than its factorization.

261652250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2147 (or 2137 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 261652250 is about 16175.6684560484. The cubic root of 261652250 is about 639.5995623304.

The spelling of 261652250 in words is "two hundred sixty-one million, six hundred fifty-two thousand, two hundred fifty".