54277781 has 2 divisors, whose sum is σ = 54277782. Its totient is φ = 54277780.

The previous prime is 54277771. The next prime is 54277823. The reversal of 54277781 is 18777245.

54277781 = 5209² + 5210².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27144100 + 27133681 = 5210^2 + 5209^2 .

It is a cyclic number.

It is not a de Polignac number, because 54277781 - 2²² = 50083477 is a prime.

It is a super-2 number, since 2×54277781² = 5892155020567922, 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 (54277721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27138890 + 27138891.

It is an arithmetic number, because the mean of its divisors is an integer number (27138891).

Almost surely, 2^54277781 is an apocalyptic number.

54277781 is the 5210-th centered square number.

It is an amenable number.

54277781 is a deficient number, since it is larger than the sum of its proper divisors (1).

54277781 is an equidigital number, since it uses as much as digits as its factorization.

54277781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 109760, while the sum is 41.

The square root of 54277781 is about 7367.3455871162. The cubic root of 54277781 is about 378.6233218663.

The spelling of 54277781 in words is "fifty-four million, two hundred seventy-seven thousand, seven hundred eighty-one".