340087561 has 6 divisors (see below), whose sum is σ = 373815386. Its totient is φ = 309170400.

The previous prime is 340087543. The next prime is 340087571. The reversal of 340087561 is 165780043.

It can be written as a sum of positive squares in only one way, i.e., 335439225 + 4648336 = 18315^2 + 2156^2 .

It is not a de Polignac number, because 340087561 - 2¹⁷ = 339956489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340087571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1405200 + ... + 1405441.

Almost surely, 2^340087561 is an apocalyptic number.

It is an amenable number.

340087561 is a deficient number, since it is larger than the sum of its proper divisors (33727825).

340087561 is a wasteful number, since it uses less digits than its factorization.

340087561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810663 (or 2810652 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 340087561 is about 18441.4630927158. The cubic root of 340087561 is about 698.0131147253.

The spelling of 340087561 in words is "three hundred forty million, eighty-seven thousand, five hundred sixty-one".