54521581 has 2 divisors, whose sum is σ = 54521582. Its totient is φ = 54521580.

The previous prime is 54521573. The next prime is 54521603. The reversal of 54521581 is 18512545.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40119556 + 14402025 = 6334^2 + 3795^2 .

It is a cyclic number.

It is not a de Polignac number, because 54521581 - 2³ = 54521573 is a prime.

It is a super-2 number, since 2×54521581² = 5945205589479122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54521501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27260790 + 27260791.

It is an arithmetic number, because the mean of its divisors is an integer number (27260791).

Almost surely, 2^54521581 is an apocalyptic number.

It is an amenable number.

54521581 is a deficient number, since it is larger than the sum of its proper divisors (1).

54521581 is an equidigital number, since it uses as much as digits as its factorization.

54521581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8000, while the sum is 31.

The square root of 54521581 is about 7383.8730352031. The cubic root of 54521581 is about 379.1893638119.

The spelling of 54521581 in words is "fifty-four million, five hundred twenty-one thousand, five hundred eighty-one".