2154123287 has 2 divisors, whose sum is σ = 2154123288. Its totient is φ = 2154123286.

The previous prime is 2154123263. The next prime is 2154123331. The reversal of 2154123287 is 7823214512.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2154123287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2154123187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077061643 + 1077061644.

It is an arithmetic number, because the mean of its divisors is an integer number (1077061644).

Almost surely, 2^2154123287 is an apocalyptic number.

2154123287 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154123287 is an equidigital number, since it uses as much as digits as its factorization.

2154123287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 35.

The square root of 2154123287 is about 46412.5337274319. The cubic root of 2154123287 is about 1291.4874349455.

Adding to 2154123287 its reverse (7823214512), we get a palindrome (9977337799).

The spelling of 2154123287 in words is "two billion, one hundred fifty-four million, one hundred twenty-three thousand, two hundred eighty-seven".