2154331145 has 4 divisors (see below), whose sum is σ = 2585197380. Its totient is φ = 1723464912.

The previous prime is 2154331141. The next prime is 2154331147. The reversal of 2154331145 is 5411334512.

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 468982336 + 1685348809 = 21656^2 + 41053^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154331145 - 2² = 2154331141 is a prime.

It is a super-2 number, since 2×2154331145² = 9282285364634022050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2154331141) 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, 215433110 + ... + 215433119.

It is an arithmetic number, because the mean of its divisors is an integer number (646299345).

Almost surely, 2^2154331145 is an apocalyptic number.

It is an amenable number.

2154331145 is a deficient number, since it is larger than the sum of its proper divisors (430866235).

2154331145 is an equidigital number, since it uses as much as digits as its factorization.

2154331145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430866234.

The product of its digits is 7200, while the sum is 29.

The square root of 2154331145 is about 46414.7729176821. The cubic root of 2154331145 is about 1291.5289734781.

Adding to 2154331145 its reverse (5411334512), we get a palindrome (7565665657).

The spelling of 2154331145 in words is "two billion, one hundred fifty-four million, three hundred thirty-one thousand, one hundred forty-five".