840614561 has 4 divisors (see below), whose sum is σ = 869601300. Its totient is φ = 811627824.

The previous prime is 840614543. The next prime is 840614573. The reversal of 840614561 is 165416048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 607869025 + 232745536 = 24655^2 + 15256^2 .

It is a cyclic number.

It is not a de Polignac number, because 840614561 - 2⁶ = 840614497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840614501) 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, 14493326 + ... + 14493383.

It is an arithmetic number, because the mean of its divisors is an integer number (217400325).

Almost surely, 2^840614561 is an apocalyptic number.

It is an amenable number.

840614561 is a deficient number, since it is larger than the sum of its proper divisors (28986739).

840614561 is a wasteful number, since it uses less digits than its factorization.

840614561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28986738.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 840614561 is about 28993.3537384001. The cubic root of 840614561 is about 943.7688439961.

The spelling of 840614561 in words is "eight hundred forty million, six hundred fourteen thousand, five hundred sixty-one".