261761343 has 16 divisors (see below), whose sum is σ = 358223712. Its totient is φ = 169920000.

The previous prime is 261761323. The next prime is 261761363. The reversal of 261761343 is 343167162.

It is an interprime number because it is at equal distance from previous prime (261761323) and next prime (261761363).

It is a de Polignac number, because none of the positive numbers 2^k-261761343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261761323) 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 15 ways as a sum of consecutive naturals, for example, 72153 + ... + 75693.

It is an arithmetic number, because the mean of its divisors is an integer number (22388982).

Almost surely, 2^261761343 is an apocalyptic number.

261761343 is a deficient number, since it is larger than the sum of its proper divisors (96462369).

261761343 is a wasteful number, since it uses less digits than its factorization.

261761343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4186.

The product of its digits is 18144, while the sum is 33.

The square root of 261761343 is about 16179.0402372947. The cubic root of 261761343 is about 639.6884412908.

The spelling of 261761343 in words is "two hundred sixty-one million, seven hundred sixty-one thousand, three hundred forty-three".