261559343 has 4 divisors (see below), whose sum is σ = 263959080. Its totient is φ = 259159608.

The previous prime is 261559303. The next prime is 261559367. The reversal of 261559343 is 343955162.

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 261559343 - 2⁸ = 261559087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261559297 and 261559306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261559303) 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, 1199705 + ... + 1199922.

It is an arithmetic number, because the mean of its divisors is an integer number (65989770).

Almost surely, 2^261559343 is an apocalyptic number.

261559343 is a deficient number, since it is larger than the sum of its proper divisors (2399737).

261559343 is a wasteful number, since it uses less digits than its factorization.

261559343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399736.

The product of its digits is 97200, while the sum is 38.

The square root of 261559343 is about 16172.7963877618. The cubic root of 261559343 is about 639.5238507562.

The spelling of 261559343 in words is "two hundred sixty-one million, five hundred fifty-nine thousand, three hundred forty-three".