2154923511 has 8 divisors (see below), whose sum is σ = 3094249200. Its totient is φ = 1326106752.

The previous prime is 2154923489. The next prime is 2154923591. The reversal of 2154923511 is 1153294512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2154923511 - 2¹¹ = 2154921463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154923591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27627186 + ... + 27627263.

It is an arithmetic number, because the mean of its divisors is an integer number (386781150).

Almost surely, 2^2154923511 is an apocalyptic number.

2154923511 is a deficient number, since it is larger than the sum of its proper divisors (939325689).

2154923511 is a wasteful number, since it uses less digits than its factorization.

2154923511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55254465.

The product of its digits is 10800, while the sum is 33.

The square root of 2154923511 is about 46421.1537017339. The cubic root of 2154923511 is about 1291.6473377854.

The spelling of 2154923511 in words is "two billion, one hundred fifty-four million, nine hundred twenty-three thousand, five hundred eleven".