54447721 has 2 divisors, whose sum is σ = 54447722. Its totient is φ = 54447720.

The previous prime is 54447697. The next prime is 54447733. The reversal of 54447721 is 12774445.

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., 52359696 + 2088025 = 7236^2 + 1445^2 .

It is a cyclic number.

It is not a de Polignac number, because 54447721 - 2⁷ = 54447593 is a prime.

It is not a weakly prime, because it can be changed into another prime (54447791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27223860 + 27223861.

It is an arithmetic number, because the mean of its divisors is an integer number (27223861).

Almost surely, 2^54447721 is an apocalyptic number.

It is an amenable number.

54447721 is a deficient number, since it is larger than the sum of its proper divisors (1).

54447721 is an equidigital number, since it uses as much as digits as its factorization.

54447721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31360, while the sum is 34.

The square root of 54447721 is about 7378.8698999237. The cubic root of 54447721 is about 379.0180580503.

The spelling of 54447721 in words is "fifty-four million, four hundred forty-seven thousand, seven hundred twenty-one".