261042243 has 16 divisors (see below), whose sum is σ = 433940736. Its totient is φ = 135606240.

The previous prime is 261042193. The next prime is 261042263. The reversal of 261042243 is 342240162.

261042243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261042243 - 2¹² = 261038147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261042263) 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, 564796 + ... + 565257.

It is an arithmetic number, because the mean of its divisors is an integer number (27121296).

Almost surely, 2^261042243 is an apocalyptic number.

261042243 is a deficient number, since it is larger than the sum of its proper divisors (172898493).

261042243 is a wasteful number, since it uses less digits than its factorization.

261042243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130074.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 261042243 is about 16156.8017565359. The cubic root of 261042243 is about 639.1021288023.

The spelling of 261042243 in words is "two hundred sixty-one million, forty-two thousand, two hundred forty-three".