5181512891 has 2 divisors, whose sum is σ = 5181512892. Its totient is φ = 5181512890.

The previous prime is 5181512879. The next prime is 5181512899. The reversal of 5181512891 is 1982151815.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5181512891 - 2⁶ = 5181512827 is a prime.

It is not a weakly prime, because it can be changed into another prime (5181512899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2590756445 + 2590756446.

It is an arithmetic number, because the mean of its divisors is an integer number (2590756446).

Almost surely, 2^5181512891 is an apocalyptic number.

5181512891 is a deficient number, since it is larger than the sum of its proper divisors (1).

5181512891 is an equidigital number, since it uses as much as digits as its factorization.

5181512891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 41.

The square root of 5181512891 is about 71982.7263376430. The cubic root of 5181512891 is about 1730.4226629426.

The spelling of 5181512891 in words is "five billion, one hundred eighty-one million, five hundred twelve thousand, eight hundred ninety-one".