343561261 has 4 divisors (see below), whose sum is σ = 348400224. Its totient is φ = 338722300.

The previous prime is 343561237. The next prime is 343561277. The reversal of 343561261 is 162165343.

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, and also an emirpimes, since its reverse is a distinct semiprime: 162165343 = 3469 ⋅46747.

It is a cyclic number.

It is not a de Polignac number, because 343561261 - 2¹³ = 343553069 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 (343561291) 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, 2419375 + ... + 2419516.

It is an arithmetic number, because the mean of its divisors is an integer number (87100056).

Almost surely, 2^343561261 is an apocalyptic number.

It is an amenable number.

343561261 is a deficient number, since it is larger than the sum of its proper divisors (4838963).

343561261 is an equidigital number, since it uses as much as digits as its factorization.

343561261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4838962.

The product of its digits is 12960, while the sum is 31.

The square root of 343561261 is about 18535.4056065682. The cubic root of 343561261 is about 700.3816021374.

The spelling of 343561261 in words is "three hundred forty-three million, five hundred sixty-one thousand, two hundred sixty-one".