2154122545 has 4 divisors (see below), whose sum is σ = 2584947060. Its totient is φ = 1723298032.

The previous prime is 2154122543. The next prime is 2154122557. The reversal of 2154122545 is 5452214512.

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 572549184 + 1581573361 = 23928^2 + 39769^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154122545 - 2¹ = 2154122543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2154122543) 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, 215412250 + ... + 215412259.

It is an arithmetic number, because the mean of its divisors is an integer number (646236765).

Almost surely, 2^2154122545 is an apocalyptic number.

It is an amenable number.

2154122545 is a deficient number, since it is larger than the sum of its proper divisors (430824515).

2154122545 is an equidigital number, since it uses as much as digits as its factorization.

2154122545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430824514.

The product of its digits is 16000, while the sum is 31.

The square root of 2154122545 is about 46412.5257339008. The cubic root of 2154122545 is about 1291.4872866587.

The spelling of 2154122545 in words is "two billion, one hundred fifty-four million, one hundred twenty-two thousand, five hundred forty-five".