261015143 has 4 divisors (see below), whose sum is σ = 267381408. Its totient is φ = 254648880.

The previous prime is 261015137. The next prime is 261015149. The reversal of 261015143 is 341510162.

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

It is an interprime number because it is at equal distance from previous prime (261015137) and next prime (261015149).

It is a cyclic number.

It is not a de Polignac number, because 261015143 - 2¹⁶ = 260949607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261015149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3183071 + ... + 3183152.

It is an arithmetic number, because the mean of its divisors is an integer number (66845352).

Almost surely, 2^261015143 is an apocalyptic number.

261015143 is a deficient number, since it is larger than the sum of its proper divisors (6366265).

261015143 is an equidigital number, since it uses as much as digits as its factorization.

261015143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6366264.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 261015143 is about 16155.9630786902. The cubic root of 261015143 is about 639.0800119898.

The spelling of 261015143 in words is "two hundred sixty-one million, fifteen thousand, one hundred forty-three".