340561781 has 4 divisors (see below), whose sum is σ = 389213472. Its totient is φ = 291910092.

The previous prime is 340561733. The next prime is 340561783. The reversal of 340561781 is 187165043.

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 340561781 - 2¹⁰ = 340560757 is a prime.

It is a super-2 number, since 2×340561781² = 231964653355783922, which contains 22 as substring.

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 (340561783) 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, 24325835 + ... + 24325848.

It is an arithmetic number, because the mean of its divisors is an integer number (97303368).

Almost surely, 2^340561781 is an apocalyptic number.

It is an amenable number.

340561781 is a deficient number, since it is larger than the sum of its proper divisors (48651691).

340561781 is an equidigital number, since it uses as much as digits as its factorization.

340561781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48651690.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 340561781 is about 18454.3160534331. The cubic root of 340561781 is about 698.3374018417.

The spelling of 340561781 in words is "three hundred forty million, five hundred sixty-one thousand, seven hundred eighty-one".