2155234517 has 4 divisors (see below), whose sum is σ = 2282013036. Its totient is φ = 2028456000.

The previous prime is 2155234511. The next prime is 2155234531. The reversal of 2155234517 is 7154325512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 918938596 + 1236295921 = 30314^2 + 35161^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155234517 - 2¹⁴ = 2155218133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155234511) 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 3 ways as a sum of consecutive naturals, for example, 63389234 + ... + 63389267.

It is an arithmetic number, because the mean of its divisors is an integer number (570503259).

Almost surely, 2^2155234517 is an apocalyptic number.

It is an amenable number.

2155234517 is a deficient number, since it is larger than the sum of its proper divisors (126778519).

2155234517 is a wasteful number, since it uses less digits than its factorization.

2155234517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126778518.

The product of its digits is 42000, while the sum is 35.

The square root of 2155234517 is about 46424.5034114529. The cubic root of 2155234517 is about 1291.7094731306.

The spelling of 2155234517 in words is "two billion, one hundred fifty-five million, two hundred thirty-four thousand, five hundred seventeen".