544540781 has 2 divisors, whose sum is σ = 544540782. Its totient is φ = 544540780.

The previous prime is 544540771. The next prime is 544540807. The reversal of 544540781 is 187045445.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 490223881 + 54316900 = 22141^2 + 7370^2 .

It is a cyclic number.

It is not a de Polignac number, because 544540781 - 2¹⁴ = 544524397 is a prime.

It is a super-2 number, since 2×544540781² = 593049324344179922, 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 (544540751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272270390 + 272270391.

It is an arithmetic number, because the mean of its divisors is an integer number (272270391).

Almost surely, 2^544540781 is an apocalyptic number.

It is an amenable number.

544540781 is a deficient number, since it is larger than the sum of its proper divisors (1).

544540781 is an equidigital number, since it uses as much as digits as its factorization.

544540781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 89600, while the sum is 38.

The square root of 544540781 is about 23335.3975967842. The cubic root of 544540781 is about 816.6014309870.

The spelling of 544540781 in words is "five hundred forty-four million, five hundred forty thousand, seven hundred eighty-one".