54930781 has 2 divisors, whose sum is σ = 54930782. Its totient is φ = 54930780.

The previous prime is 54930779. The next prime is 54930797. The reversal of 54930781 is 18703945.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27994681 + 26936100 = 5291^2 + 5190^2 .

It is a cyclic number.

It is not a de Polignac number, because 54930781 - 2¹ = 54930779 is a prime.

It is a super-2 number, since 2×54930781² = 6034781402539922, which contains 22 as substring.

Together with 54930779, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 54930781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54930721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27465390 + 27465391.

It is an arithmetic number, because the mean of its divisors is an integer number (27465391).

Almost surely, 2^54930781 is an apocalyptic number.

It is an amenable number.

54930781 is a deficient number, since it is larger than the sum of its proper divisors (1).

54930781 is an equidigital number, since it uses as much as digits as its factorization.

54930781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 54930781 is about 7411.5302738368. The cubic root of 54930781 is about 380.1356417890.

The spelling of 54930781 in words is "fifty-four million, nine hundred thirty thousand, seven hundred eighty-one".