261255250 has 16 divisors (see below), whose sum is σ = 489070296. Its totient is φ = 104502000.

The previous prime is 261255227. The next prime is 261255251. The reversal of 261255250 is 52552162.

It can be written as a sum of positive squares in 4 ways, for example, as 19421649 + 241833601 = 4407^2 + 15551^2 .

It is not an unprimeable number, because it can be changed into a prime (261255251) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 522261 + ... + 522760.

Almost surely, 2^261255250 is an apocalyptic number.

261255250 is a deficient number, since it is larger than the sum of its proper divisors (227815046).

261255250 is a wasteful number, since it uses less digits than its factorization.

261255250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045038 (or 1045028 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 261255250 is about 16163.3922800877. The cubic root of 261255250 is about 639.2759144889.

It can be divided in two parts, 26125 and 5250, that added together give a triangular number (31375 = T₂₅₀).

The spelling of 261255250 in words is "two hundred sixty-one million, two hundred fifty-five thousand, two hundred fifty".