2154161499 has 64 divisors (see below), whose sum is σ = 3619123200. Its totient is φ = 1111888512.

The previous prime is 2154161483. The next prime is 2154161509. The reversal of 2154161499 is 9941614512.

It is a happy number.

It is not a de Polignac number, because 2154161499 - 2⁴ = 2154161483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2154161499.

It is not an unprimeable number, because it can be changed into a prime (2154161459) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 959272 + ... + 961514.

It is an arithmetic number, because the mean of its divisors is an integer number (56548800).

Almost surely, 2^2154161499 is an apocalyptic number.

2154161499 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2154161499 is a deficient number, since it is larger than the sum of its proper divisors (1464961701).

2154161499 is a wasteful number, since it uses less digits than its factorization.

2154161499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384.

The product of its digits is 77760, while the sum is 42.

The square root of 2154161499 is about 46412.9453816497. The cubic root of 2154161499 is about 1291.4950714669.

The spelling of 2154161499 in words is "two billion, one hundred fifty-four million, one hundred sixty-one thousand, four hundred ninety-nine".