54405781 has 2 divisors, whose sum is σ = 54405782. Its totient is φ = 54405780.

The previous prime is 54405773. The next prime is 54405803. The reversal of 54405781 is 18750445.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48525156 + 5880625 = 6966^2 + 2425^2 .

It is a cyclic number.

It is not a de Polignac number, because 54405781 - 2³ = 54405773 is a prime.

It is a super-2 number, since 2×54405781² = 5919978012439922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54405881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27202890 + 27202891.

It is an arithmetic number, because the mean of its divisors is an integer number (27202891).

Almost surely, 2^54405781 is an apocalyptic number.

It is an amenable number.

54405781 is a deficient number, since it is larger than the sum of its proper divisors (1).

54405781 is an equidigital number, since it uses as much as digits as its factorization.

54405781 is an evil number, because the sum of its binary digits is even.

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

The square root of 54405781 is about 7376.0274538535. The cubic root of 54405781 is about 378.9207163540.

The spelling of 54405781 in words is "fifty-four million, four hundred five thousand, seven hundred eighty-one".