55041561 has 9 divisors (see below), whose sum is σ = 79536639. Its totient is φ = 36679536.

The previous prime is 55041551. The next prime is 55041587. The reversal of 55041561 is 16514055.

It is a happy number.

The square root of 55041561 is 7419.

It is a perfect power (a square), and thus also a powerful number.

55041561 is a `hidden beast` number, since 5 + 504 + 156 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 41024025 + 14017536 = 6405^2 + 3744^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 55041561 - 2¹¹ = 55039513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55041551) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 21021 + ... + 23493.

Almost surely, 2^55041561 is an apocalyptic number.

55041561 is the 7419-th square number.

55041561 is the 3710-th centered octagonal number.

It is an amenable number.

55041561 is a deficient number, since it is larger than the sum of its proper divisors (24495078).

55041561 is an frugal number, since it uses more digits than its factorization.

55041561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4952 (or 2476 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The cubic root of 55041561 is about 380.3910125685.

The spelling of 55041561 in words is "fifty-five million, forty-one thousand, five hundred sixty-one".