2154321553 has 4 divisors (see below), whose sum is σ = 2160097588. Its totient is φ = 2148545520.

The previous prime is 2154321527. The next prime is 2154321577. The reversal of 2154321553 is 3551234512.

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 462809169 + 1691512384 = 21513^2 + 41128^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154321553 - 2¹³ = 2154313361 is a prime.

It is a super-2 number, since 2×2154321553² = 9282202707440663618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2154321503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2887458 + ... + 2888203.

It is an arithmetic number, because the mean of its divisors is an integer number (540024397).

Almost surely, 2^2154321553 is an apocalyptic number.

It is an amenable number.

2154321553 is a deficient number, since it is larger than the sum of its proper divisors (5776035).

2154321553 is an equidigital number, since it uses as much as digits as its factorization.

2154321553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5776034.

The product of its digits is 18000, while the sum is 31.

The square root of 2154321553 is about 46414.6695883963. The cubic root of 2154321553 is about 1291.5270566629.

The spelling of 2154321553 in words is "two billion, one hundred fifty-four million, three hundred twenty-one thousand, five hundred fifty-three".