2154565517 has 8 divisors (see below), whose sum is σ = 2323434624. Its totient is φ = 1986144048.

The previous prime is 2154565513. The next prime is 2154565519. The reversal of 2154565517 is 7155654512.

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

It is a cyclic number.

It is not a de Polignac number, because 2154565517 - 2² = 2154565513 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 (2154565513) 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 7 ways as a sum of consecutive naturals, for example, 101873 + ... + 121190.

It is an arithmetic number, because the mean of its divisors is an integer number (290429328).

Almost surely, 2^2154565517 is an apocalyptic number.

It is an amenable number.

2154565517 is a deficient number, since it is larger than the sum of its proper divisors (168869107).

2154565517 is a wasteful number, since it uses less digits than its factorization.

2154565517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223819.

The product of its digits is 210000, while the sum is 41.

The square root of 2154565517 is about 46417.2976055263. The cubic root of 2154565517 is about 1291.5758073880.

The spelling of 2154565517 in words is "two billion, one hundred fifty-four million, five hundred sixty-five thousand, five hundred seventeen".