2145001779 has 6 divisors (see below), whose sum is σ = 3098335916. Its totient is φ = 1430001180.

The previous prime is 2145001763. The next prime is 2145001783. The reversal of 2145001779 is 9771005412.

It is a happy number.

It is not a de Polignac number, because 2145001779 - 2⁴ = 2145001763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145001279) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119166757 + ... + 119166774.

Almost surely, 2^2145001779 is an apocalyptic number.

2145001779 is a deficient number, since it is larger than the sum of its proper divisors (953334137).

2145001779 is a wasteful number, since it uses less digits than its factorization.

2145001779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238333537 (or 238333534 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 2145001779 is about 46314.1639134293. The cubic root of 2145001779 is about 1289.6619467530.

The spelling of 2145001779 in words is "two billion, one hundred forty-five million, one thousand, seven hundred seventy-nine".