540631661 has 8 divisors (see below), whose sum is σ = 560302848. Its totient is φ = 521100000.

The previous prime is 540631633. The next prime is 540631687. The reversal of 540631661 is 166136045.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 540631661 - 2¹⁴ = 540615277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540631361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26960 + ... + 42521.

It is an arithmetic number, because the mean of its divisors is an integer number (70037856).

Almost surely, 2^540631661 is an apocalyptic number.

It is an amenable number.

540631661 is a deficient number, since it is larger than the sum of its proper divisors (19671187).

540631661 is a wasteful number, since it uses less digits than its factorization.

540631661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69763.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 540631661 is about 23251.4872857630. The cubic root of 540631661 is about 814.6426782445.

The spelling of 540631661 in words is "five hundred forty million, six hundred thirty-one thousand, six hundred sixty-one".