2158120487 has 2 divisors, whose sum is σ = 2158120488. Its totient is φ = 2158120486.

The previous prime is 2158120441. The next prime is 2158120513. The reversal of 2158120487 is 7840218512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2158120487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2158120487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2158120387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079060243 + 1079060244.

It is an arithmetic number, because the mean of its divisors is an integer number (1079060244).

Almost surely, 2^2158120487 is an apocalyptic number.

2158120487 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158120487 is an equidigital number, since it uses as much as digits as its factorization.

2158120487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35840, while the sum is 38.

The square root of 2158120487 is about 46455.5754135066. The cubic root of 2158120487 is about 1292.2857711428.

Adding to 2158120487 its reverse (7840218512), we get a palindrome (9998338999).

The spelling of 2158120487 in words is "two billion, one hundred fifty-eight million, one hundred twenty thousand, four hundred eighty-seven".