340643261 has 4 divisors (see below), whose sum is σ = 389306592. Its totient is φ = 291979932.

The previous prime is 340643249. The next prime is 340643273. The reversal of 340643261 is 162346043.

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 an interprime number because it is at equal distance from previous prime (340643249) and next prime (340643273).

It is a cyclic number.

It is not a de Polignac number, because 340643261 - 2⁶ = 340643197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340643461) 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, 24331655 + ... + 24331668.

It is an arithmetic number, because the mean of its divisors is an integer number (97326648).

Almost surely, 2^340643261 is an apocalyptic number.

It is an amenable number.

340643261 is a deficient number, since it is larger than the sum of its proper divisors (48663331).

340643261 is an equidigital number, since it uses as much as digits as its factorization.

340643261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48663330.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 340643261 is about 18456.5235350539. The cubic root of 340643261 is about 698.3930902145.

The spelling of 340643261 in words is "three hundred forty million, six hundred forty-three thousand, two hundred sixty-one".