2158471787 has 2 divisors, whose sum is σ = 2158471788. Its totient is φ = 2158471786.

The previous prime is 2158471741. The next prime is 2158471829. The reversal of 2158471787 is 7871748512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2158471787 - 2¹⁰ = 2158470763 is a prime.

It is not a weakly prime, because it can be changed into another prime (2158471187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079235893 + 1079235894.

It is an arithmetic number, because the mean of its divisors is an integer number (1079235894).

Almost surely, 2^2158471787 is an apocalyptic number.

2158471787 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158471787 is an equidigital number, since it uses as much as digits as its factorization.

2158471787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 878080, while the sum is 50.

The square root of 2158471787 is about 46459.3562912789. The cubic root of 2158471787 is about 1292.3558869933.

The spelling of 2158471787 in words is "two billion, one hundred fifty-eight million, four hundred seventy-one thousand, seven hundred eighty-seven".