2154123505 has 16 divisors (see below), whose sum is σ = 2725115904. Its totient is φ = 1632219840.

The previous prime is 2154123497. The next prime is 2154123527. The reversal of 2154123505 is 5053214512.

It is not a de Polignac number, because 2154123505 - 2³ = 2154123497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140562 + ... + 155131.

It is an arithmetic number, because the mean of its divisors is an integer number (170319744).

Almost surely, 2^2154123505 is an apocalyptic number.

It is an amenable number.

2154123505 is a deficient number, since it is larger than the sum of its proper divisors (570992399).

2154123505 is a wasteful number, since it uses less digits than its factorization.

2154123505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295776.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 2154123505 is about 46412.5360759353. The cubic root of 2154123505 is about 1291.4874785122.

The spelling of 2154123505 in words is "two billion, one hundred fifty-four million, one hundred twenty-three thousand, five hundred five".