2145945451 has 16 divisors (see below), whose sum is σ = 2395784160. Its totient is φ = 1908506880.

The previous prime is 2145945437. The next prime is 2145945467. The reversal of 2145945451 is 1545495412.

It is a cyclic number.

It is not a de Polignac number, because 2145945451 - 2⁵ = 2145945419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145945421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179311 + ... + 190903.

It is an arithmetic number, because the mean of its divisors is an integer number (149736510).

Almost surely, 2^2145945451 is an apocalyptic number.

2145945451 is a deficient number, since it is larger than the sum of its proper divisors (249838709).

2145945451 is a wasteful number, since it uses less digits than its factorization.

2145945451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12126.

The product of its digits is 144000, while the sum is 40.

The square root of 2145945451 is about 46324.3505189226. The cubic root of 2145945451 is about 1289.8510436343.

The spelling of 2145945451 in words is "two billion, one hundred forty-five million, nine hundred forty-five thousand, four hundred fifty-one".