545660981 has 16 divisors (see below), whose sum is σ = 582067200. Its totient is φ = 510073200.

The previous prime is 545660963. The next prime is 545660989. The reversal of 545660981 is 189066545.

It is a cyclic number.

It is not a de Polignac number, because 545660981 - 2¹⁰ = 545659957 is a prime.

It is a super-2 number, since 2×545660981² = 595491812371764722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545660989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 524660 + ... + 525698.

It is an arithmetic number, because the mean of its divisors is an integer number (36379200).

Almost surely, 2^545660981 is an apocalyptic number.

It is an amenable number.

545660981 is a deficient number, since it is larger than the sum of its proper divisors (36406219).

545660981 is a wasteful number, since it uses less digits than its factorization.

545660981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 545660981 is about 23359.3874277559. The cubic root of 545660981 is about 817.1610036323.

The spelling of 545660981 in words is "five hundred forty-five million, six hundred sixty thousand, nine hundred eighty-one".