5111885781491 has 2 divisors, whose sum is σ = 5111885781492. Its totient is φ = 5111885781490.

The previous prime is 5111885781481. The next prime is 5111885781493. The reversal of 5111885781491 is 1941875881115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5111885781491 - 2⁶ = 5111885781427 is a prime.

It is a super-2 number, since 2×5111885781491² (a number of 26 digits) contains 22 as substring.

Together with 5111885781493, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5111885781491.

It is not a weakly prime, because it can be changed into another prime (5111885781493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2555942890745 + 2555942890746.

It is an arithmetic number, because the mean of its divisors is an integer number (2555942890746).

Almost surely, 2^{5111885781491} is an apocalyptic number.

5111885781491 is a deficient number, since it is larger than the sum of its proper divisors (1).

5111885781491 is an equidigital number, since it uses as much as digits as its factorization.

5111885781491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3225600, while the sum is 59.

The spelling of 5111885781491 in words is "five trillion, one hundred eleven billion, eight hundred eighty-five million, seven hundred eighty-one thousand, four hundred ninety-one".