2154506775 has 24 divisors (see below), whose sum is σ = 3564771840. Its totient is φ = 1148214240.

The previous prime is 2154506771. The next prime is 2154506777. The reversal of 2154506775 is 5776054512.

It is a happy number.

It is not a de Polignac number, because 2154506775 - 2² = 2154506771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154506771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97944 + ... + 117906.

It is an arithmetic number, because the mean of its divisors is an integer number (148532160).

Almost surely, 2^2154506775 is an apocalyptic number.

2154506775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2154506775 is a deficient number, since it is larger than the sum of its proper divisors (1410265065).

2154506775 is a wasteful number, since it uses less digits than its factorization.

2154506775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21415 (or 21410 counting only the distinct ones).

The product of its (nonzero) digits is 294000, while the sum is 42.

The square root of 2154506775 is about 46416.6648414123. The cubic root of 2154506775 is about 1291.5640694553.

The spelling of 2154506775 in words is "two billion, one hundred fifty-four million, five hundred six thousand, seven hundred seventy-five".