5436518981 has 2 divisors, whose sum is σ = 5436518982. Its totient is φ = 5436518980.

The previous prime is 5436518977. The next prime is 5436519019. The reversal of 5436518981 is 1898156345.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5382569956 + 53949025 = 73366^2 + 7345^2 .

It is a cyclic number.

It is not a de Polignac number, because 5436518981 - 2² = 5436518977 is a prime.

It is a super-2 number, since 2×5436518981² = 59111477261546556722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5436518881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2718259490 + 2718259491.

It is an arithmetic number, because the mean of its divisors is an integer number (2718259491).

Almost surely, 2^5436518981 is an apocalyptic number.

It is an amenable number.

5436518981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5436518981 is an equidigital number, since it uses as much as digits as its factorization.

5436518981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1036800, while the sum is 50.

The square root of 5436518981 is about 73732.7537869026. The cubic root of 5436518981 is about 1758.3566552994.

The spelling of 5436518981 in words is "five billion, four hundred thirty-six million, five hundred eighteen thousand, nine hundred eighty-one".