54021581 has 2 divisors, whose sum is σ = 54021582. Its totient is φ = 54021580.

The previous prime is 54021553. The next prime is 54021593. The reversal of 54021581 is 18512045.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53728900 + 292681 = 7330^2 + 541^2 .

It is a cyclic number.

It is not a de Polignac number, because 54021581 - 2¹⁴ = 54005197 is a prime.

It is a super-2 number, since 2×54021581² = 5836662427479122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 54021581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54021511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27010790 + 27010791.

It is an arithmetic number, because the mean of its divisors is an integer number (27010791).

Almost surely, 2^54021581 is an apocalyptic number.

It is an amenable number.

54021581 is a deficient number, since it is larger than the sum of its proper divisors (1).

54021581 is an equidigital number, since it uses as much as digits as its factorization.

54021581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 54021581 is about 7349.9374827273. The cubic root of 54021581 is about 378.0266607736.

The spelling of 54021581 in words is "fifty-four million, twenty-one thousand, five hundred eighty-one".