5291389235981 has 2 divisors, whose sum is σ = 5291389235982. Its totient is φ = 5291389235980.

The previous prime is 5291389235959. The next prime is 5291389236127. The reversal of 5291389235981 is 1895329831925.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3716640323881 + 1574748912100 = 1927859^2 + 1254890^2 .

It is a cyclic number.

It is not a de Polignac number, because 5291389235981 - 2⁶ = 5291389235917 is a prime.

It is a super-2 number, since 2×5291389235981² (a number of 26 digits) 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 (5291389235921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2645694617990 + 2645694617991.

It is an arithmetic number, because the mean of its divisors is an integer number (2645694617991).

Almost surely, 2^{5291389235981} is an apocalyptic number.

It is an amenable number.

5291389235981 is a deficient number, since it is larger than the sum of its proper divisors (1).

5291389235981 is an equidigital number, since it uses as much as digits as its factorization.

5291389235981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41990400, while the sum is 65.

The spelling of 5291389235981 in words is "five trillion, two hundred ninety-one billion, three hundred eighty-nine million, two hundred thirty-five thousand, nine hundred eighty-one".