261201043 has 4 divisors (see below), whose sum is σ = 266758560. Its totient is φ = 255643528.

The previous prime is 261201029. The next prime is 261201047. The reversal of 261201043 is 340102162.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 261201043 - 2⁵ = 261201011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261201043.

It is not an unprimeable number, because it can be changed into a prime (261201047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2778688 + ... + 2778781.

It is an arithmetic number, because the mean of its divisors is an integer number (66689640).

Almost surely, 2^261201043 is an apocalyptic number.

261201043 is a deficient number, since it is larger than the sum of its proper divisors (5557517).

261201043 is an equidigital number, since it uses as much as digits as its factorization.

261201043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5557516.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 261201043 is about 16161.7153483162. The cubic root of 261201043 is about 639.2316976723.

The spelling of 261201043 in words is "two hundred sixty-one million, two hundred one thousand, forty-three".