261026043 has 4 divisors (see below), whose sum is σ = 348034728. Its totient is φ = 174017360.

The previous prime is 261025997. The next prime is 261026063. The reversal of 261026043 is 340620162.

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

It is a cyclic number.

It is not a de Polignac number, because 261026043 - 2⁶ = 261025979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261026063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43504338 + ... + 43504343.

It is an arithmetic number, because the mean of its divisors is an integer number (87008682).

Almost surely, 2^261026043 is an apocalyptic number.

261026043 is a deficient number, since it is larger than the sum of its proper divisors (87008685).

261026043 is an equidigital number, since it uses as much as digits as its factorization.

261026043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87008684.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 261026043 is about 16156.3004119136. The cubic root of 261026043 is about 639.0889078659.

The spelling of 261026043 in words is "two hundred sixty-one million, twenty-six thousand, forty-three".