54521526581 has 2 divisors, whose sum is σ = 54521526582. Its totient is φ = 54521526580.

The previous prime is 54521526503. The next prime is 54521526599. The reversal of 54521526581 is 18562512545.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44761864900 + 9759661681 = 211570^2 + 98791^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54521526581 is a prime.

It is a super-2 number, since 2×54521526581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54521526181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27260763290 + 27260763291.

It is an arithmetic number, because the mean of its divisors is an integer number (27260763291).

Almost surely, 2^54521526581 is an apocalyptic number.

It is an amenable number.

54521526581 is a deficient number, since it is larger than the sum of its proper divisors (1).

54521526581 is an equidigital number, since it uses as much as digits as its factorization.

54521526581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480000, while the sum is 44.

The spelling of 54521526581 in words is "fifty-four billion, five hundred twenty-one million, five hundred twenty-six thousand, five hundred eighty-one".