54553581 has 30 divisors (see below), whose sum is σ = 83309226. Its totient is φ = 35575200.

The previous prime is 54553571. The next prime is 54553613. The reversal of 54553581 is 18535545.

It is a happy number.

54553581 is a `hidden beast` number, since 5 + 45 + 535 + 81 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 14976900 + 39576681 = 3870^2 + 6291^2 .

It is not a de Polignac number, because 54553581 - 2⁶ = 54553517 is a prime.

It is a super-2 number, since 2×54553581² = 5952186399847122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54553501) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 301311 + ... + 301491.

Almost surely, 2^54553581 is an apocalyptic number.

It is an amenable number.

54553581 is a deficient number, since it is larger than the sum of its proper divisors (28755645).

54553581 is an equidigital number, since it uses as much as digits as its factorization.

54553581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 245 counting only the distinct ones).

The product of its digits is 60000, while the sum is 36.

The square root of 54553581 is about 7386.0396018435. The cubic root of 54553581 is about 379.2635343591.

The spelling of 54553581 in words is "fifty-four million, five hundred fifty-three thousand, five hundred eighty-one".