243750261 has 16 divisors (see below), whose sum is σ = 328204800. Its totient is φ = 160904688.

The previous prime is 243750257. The next prime is 243750277. The reversal of 243750261 is 162057342.

It is not a de Polignac number, because 243750261 - 2² = 243750257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243750281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274360 + ... + 275246.

It is an arithmetic number, because the mean of its divisors is an integer number (20512800).

Almost surely, 2^243750261 is an apocalyptic number.

It is an amenable number.

243750261 is a deficient number, since it is larger than the sum of its proper divisors (84454539).

243750261 is a wasteful number, since it uses less digits than its factorization.

243750261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 243750261 is about 15612.5033546834. The cubic root of 243750261 is about 624.6667116885. Note that the first 3 decimals are identical.

The spelling of 243750261 in words is "two hundred forty-three million, seven hundred fifty thousand, two hundred sixty-one".