2145255451 has 4 divisors (see below), whose sum is σ = 2190899232. Its totient is φ = 2099611672.

The previous prime is 2145255443. The next prime is 2145255457. The reversal of 2145255451 is 1545525412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2145255451 - 2³ = 2145255443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145255457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22821820 + ... + 22821913.

It is an arithmetic number, because the mean of its divisors is an integer number (547724808).

Almost surely, 2^2145255451 is an apocalyptic number.

2145255451 is a deficient number, since it is larger than the sum of its proper divisors (45643781).

2145255451 is an equidigital number, since it uses as much as digits as its factorization.

2145255451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45643780.

The product of its digits is 40000, while the sum is 34.

The square root of 2145255451 is about 46316.9024331291. The cubic root of 2145255451 is about 1289.7127840426.

The spelling of 2145255451 in words is "two billion, one hundred forty-five million, two hundred fifty-five thousand, four hundred fifty-one".