54151781 has 2 divisors, whose sum is σ = 54151782. Its totient is φ = 54151780.

The previous prime is 54151777. The next prime is 54151813. The reversal of 54151781 is 18715145.

54151781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (54151813) can be obtained adding 54151781 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44102881 + 10048900 = 6641^2 + 3170^2 .

It is a cyclic number.

It is not a de Polignac number, because 54151781 - 2² = 54151777 is a prime.

It is a super-2 number, since 2×54151781² = 5864830770943922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54157781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27075890 + 27075891.

It is an arithmetic number, because the mean of its divisors is an integer number (27075891).

Almost surely, 2^54151781 is an apocalyptic number.

It is an amenable number.

54151781 is a deficient number, since it is larger than the sum of its proper divisors (1).

54151781 is an equidigital number, since it uses as much as digits as its factorization.

54151781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5600, while the sum is 32.

The square root of 54151781 is about 7358.7893705419. The cubic root of 54151781 is about 378.3301171666.

The spelling of 54151781 in words is "fifty-four million, one hundred fifty-one thousand, seven hundred eighty-one".