2145404149 has 4 divisors (see below), whose sum is σ = 2451890464. Its totient is φ = 1838917836.

The previous prime is 2145404147. The next prime is 2145404179. The reversal of 2145404149 is 9414045412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2145404149 - 2¹ = 2145404147 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145404147) 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, 153243147 + ... + 153243160.

It is an arithmetic number, because the mean of its divisors is an integer number (612972616).

Almost surely, 2^2145404149 is an apocalyptic number.

It is an amenable number.

2145404149 is a deficient number, since it is larger than the sum of its proper divisors (306486315).

2145404149 is an equidigital number, since it uses as much as digits as its factorization.

2145404149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306486314.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 2145404149 is about 46318.5076292404. The cubic root of 2145404149 is about 1289.7425820915.

The spelling of 2145404149 in words is "two billion, one hundred forty-five million, four hundred four thousand, one hundred forty-nine".