2154100045 has 4 divisors (see below), whose sum is σ = 2584920060. Its totient is φ = 1723280032.

The previous prime is 2154100021. The next prime is 2154100051. The reversal of 2154100045 is 5400014512.

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 352012644 + 1802087401 = 18762^2 + 42451^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154100045 - 2⁷ = 2154099917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2154099989 and 2154100025.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215410000 + ... + 215410009.

It is an arithmetic number, because the mean of its divisors is an integer number (646230015).

Almost surely, 2^2154100045 is an apocalyptic number.

It is an amenable number.

2154100045 is a deficient number, since it is larger than the sum of its proper divisors (430820015).

2154100045 is an equidigital number, since it uses as much as digits as its factorization.

2154100045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430820014.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 2154100045 is about 46412.2833418051. The cubic root of 2154100045 is about 1291.4827900769.

Adding to 2154100045 its reverse (5400014512), we get a palindrome (7554114557).

The spelling of 2154100045 in words is "two billion, one hundred fifty-four million, one hundred thousand, forty-five".