540561851 has 4 divisors (see below), whose sum is σ = 542300304. Its totient is φ = 538823400.

The previous prime is 540561811. The next prime is 540561863. The reversal of 540561851 is 158165045.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 158165045 = 5 ⋅31633009.

It is a cyclic number.

It is not a de Polignac number, because 540561851 - 2¹⁸ = 540299707 is a prime.

It is a super-2 number, since 2×540561851² = 584414229513092402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (540561811) 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 3 ways as a sum of consecutive naturals, for example, 868760 + ... + 869381.

It is an arithmetic number, because the mean of its divisors is an integer number (135575076).

Almost surely, 2^540561851 is an apocalyptic number.

540561851 is a deficient number, since it is larger than the sum of its proper divisors (1738453).

540561851 is a wasteful number, since it uses less digits than its factorization.

540561851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738452.

The product of its (nonzero) digits is 24000, while the sum is 35.

The square root of 540561851 is about 23249.9860430066. The cubic root of 540561851 is about 814.6076126860.

The spelling of 540561851 in words is "five hundred forty million, five hundred sixty-one thousand, eight hundred fifty-one".