54782521 has 2 divisors, whose sum is σ = 54782522. Its totient is φ = 54782520.

The previous prime is 54782447. The next prime is 54782531. The reversal of 54782521 is 12528745.

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., 53860921 + 921600 = 7339^2 + 960^2 .

It is a cyclic number.

It is not a de Polignac number, because 54782521 - 2⁹ = 54782009 is a prime.

It is a super-2 number, since 2×54782521² = 6002249214230882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (54782531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27391260 + 27391261.

It is an arithmetic number, because the mean of its divisors is an integer number (27391261).

Almost surely, 2^54782521 is an apocalyptic number.

It is an amenable number.

54782521 is a deficient number, since it is larger than the sum of its proper divisors (1).

54782521 is an equidigital number, since it uses as much as digits as its factorization.

54782521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22400, while the sum is 34.

The square root of 54782521 is about 7401.5215327661. The cubic root of 54782521 is about 379.7933340686.

The spelling of 54782521 in words is "fifty-four million, seven hundred eighty-two thousand, five hundred twenty-one".