2154889517 has 4 divisors (see below), whose sum is σ = 2350788576. Its totient is φ = 1958990460.

The previous prime is 2154889501. The next prime is 2154889523. The reversal of 2154889517 is 7159884512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2154889517 - 2⁴ = 2154889501 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 (2154889537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97949513 + ... + 97949534.

It is an arithmetic number, because the mean of its divisors is an integer number (587697144).

Almost surely, 2^2154889517 is an apocalyptic number.

It is an amenable number.

2154889517 is a deficient number, since it is larger than the sum of its proper divisors (195899059).

2154889517 is a wasteful number, since it uses less digits than its factorization.

2154889517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195899058.

The product of its digits is 806400, while the sum is 50.

The square root of 2154889517 is about 46420.7875525610. The cubic root of 2154889517 is about 1291.6405458212.

The spelling of 2154889517 in words is "two billion, one hundred fifty-four million, eight hundred eighty-nine thousand, five hundred seventeen".