2154618591 has 8 divisors (see below), whose sum is σ = 2893794864. Its totient is φ = 1425927360.

The previous prime is 2154618553. The next prime is 2154618643. The reversal of 2154618591 is 1958164512.

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

It is not a de Polignac number, because 2154618591 - 2⁶ = 2154618527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154618551) 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, 2620780 + ... + 2621601.

It is an arithmetic number, because the mean of its divisors is an integer number (361724358).

Almost surely, 2^2154618591 is an apocalyptic number.

2154618591 is a deficient number, since it is larger than the sum of its proper divisors (739176273).

2154618591 is a wasteful number, since it uses less digits than its factorization.

2154618591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5242521.

The product of its digits is 86400, while the sum is 42.

The square root of 2154618591 is about 46417.8693069813. The cubic root of 2154618591 is about 1291.5864125473.

The spelling of 2154618591 in words is "two billion, one hundred fifty-four million, six hundred eighteen thousand, five hundred ninety-one".