5001247891 has 2 divisors, whose sum is σ = 5001247892. Its totient is φ = 5001247890.

The previous prime is 5001247877. The next prime is 5001247919. The reversal of 5001247891 is 1987421005.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5001247891 - 2¹⁹ = 5000723603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5001247891.

It is not a weakly prime, because it can be changed into another prime (5001247861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2500623945 + 2500623946.

It is an arithmetic number, because the mean of its divisors is an integer number (2500623946).

Almost surely, 2^5001247891 is an apocalyptic number.

5001247891 is a deficient number, since it is larger than the sum of its proper divisors (1).

5001247891 is an equidigital number, since it uses as much as digits as its factorization.

5001247891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 5001247891 is about 70719.5014900416. The cubic root of 5001247891 is about 1710.1181924165.

Adding to 5001247891 its reverse (1987421005), we get a palindrome (6988668896).

It can be divided in two parts, 50012 and 47891, that added together give a triangular number (97903 = T₄₄₂).

The spelling of 5001247891 in words is "five billion, one million, two hundred forty-seven thousand, eight hundred ninety-one".