343405261 has 4 divisors (see below), whose sum is σ = 343449792. Its totient is φ = 343360732.

The previous prime is 343405247. The next prime is 343405289. The reversal of 343405261 is 162504343.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 343405261 - 2⁵ = 343405229 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 (343405201) 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, 7381 + ... + 27226.

It is an arithmetic number, because the mean of its divisors is an integer number (85862448).

Almost surely, 2^343405261 is an apocalyptic number.

It is an amenable number.

343405261 is a deficient number, since it is larger than the sum of its proper divisors (44531).

343405261 is an equidigital number, since it uses as much as digits as its factorization.

343405261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44530.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 343405261 is about 18531.1969661973. The cubic root of 343405261 is about 700.2755792495.

It can be divided in two parts, 34340 and 5261, that added together give a square (39601 = 199²).

The spelling of 343405261 in words is "three hundred forty-three million, four hundred five thousand, two hundred sixty-one".