340557561 has 8 divisors (see below), whose sum is σ = 504529760. Its totient is φ = 227038356.

The previous prime is 340557559. The next prime is 340557673. The reversal of 340557561 is 165755043.

340557561 is a `hidden beast` number, since 3 + 40 + 5 + 57 + 561 = 666.

It is not a de Polignac number, because 340557561 - 2¹ = 340557559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340557541) 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 7 ways as a sum of consecutive naturals, for example, 6306595 + ... + 6306648.

It is an arithmetic number, because the mean of its divisors is an integer number (63066220).

Almost surely, 2^340557561 is an apocalyptic number.

It is an amenable number.

340557561 is a deficient number, since it is larger than the sum of its proper divisors (163972199).

340557561 is a wasteful number, since it uses less digits than its factorization.

340557561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12613252 (or 12613246 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 340557561 is about 18454.2017166823. The cubic root of 340557561 is about 698.3345173959.

It can be divided in two parts, 34055 and 7561, that added together give a triangular number (41616 = T₂₈₈).

The spelling of 340557561 in words is "three hundred forty million, five hundred fifty-seven thousand, five hundred sixty-one".