5244157781 has 2 divisors, whose sum is σ = 5244157782. Its totient is φ = 5244157780.

The previous prime is 5244157777. The next prime is 5244157813. The reversal of 5244157781 is 1877514425.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5132432881 + 111724900 = 71641^2 + 10570^2 .

It is a cyclic number.

It is not a de Polignac number, because 5244157781 - 2² = 5244157777 is a prime.

It is a super-2 number, since 2×5244157781² = 55002381664045687922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5244157771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2622078890 + 2622078891.

It is an arithmetic number, because the mean of its divisors is an integer number (2622078891).

Almost surely, 2^5244157781 is an apocalyptic number.

It is an amenable number.

5244157781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5244157781 is an equidigital number, since it uses as much as digits as its factorization.

5244157781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 313600, while the sum is 44.

The square root of 5244157781 is about 72416.5573677733. The cubic root of 5244157781 is about 1737.3683939861.

The spelling of 5244157781 in words is "five billion, two hundred forty-four million, one hundred fifty-seven thousand, seven hundred eighty-one".