54420781 has 2 divisors, whose sum is σ = 54420782. Its totient is φ = 54420780.

The previous prime is 54420767. The next prime is 54420787. The reversal of 54420781 is 18702445.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34035556 + 20385225 = 5834^2 + 4515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54420781 is a prime.

It is a super-2 number, since 2×54420781² = 5923242809299922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54420787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27210390 + 27210391.

It is an arithmetic number, because the mean of its divisors is an integer number (27210391).

Almost surely, 2^54420781 is an apocalyptic number.

It is an amenable number.

54420781 is a deficient number, since it is larger than the sum of its proper divisors (1).

54420781 is an equidigital number, since it uses as much as digits as its factorization.

54420781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 54420781 is about 7377.0441912734. The cubic root of 54420781 is about 378.9555367253.

The spelling of 54420781 in words is "fifty-four million, four hundred twenty thousand, seven hundred eighty-one".