54145561 has 16 divisors (see below), whose sum is σ = 59719680. Its totient is φ = 48867840.

The previous prime is 54145537. The next prime is 54145577. The reversal of 54145561 is 16554145.

It is a cyclic number.

It is not a de Polignac number, because 54145561 - 2⁷ = 54145433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54145501) 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, 66525 + ... + 67333.

It is an arithmetic number, because the mean of its divisors is an integer number (3732480).

Almost surely, 2^54145561 is an apocalyptic number.

It is an amenable number.

54145561 is a deficient number, since it is larger than the sum of its proper divisors (5574119).

54145561 is a wasteful number, since it uses less digits than its factorization.

54145561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984.

The product of its digits is 12000, while the sum is 31.

The square root of 54145561 is about 7358.3667345410. The cubic root of 54145561 is about 378.3156313185.

The spelling of 54145561 in words is "fifty-four million, one hundred forty-five thousand, five hundred sixty-one".