2145302081 has 8 divisors (see below), whose sum is σ = 2366675304. Its totient is φ = 1931978880.

The previous prime is 2145302053. The next prime is 2145302099. The reversal of 2145302081 is 1802035412.

It can be written as a sum of positive squares in 4 ways, for example, as 361000000 + 1784302081 = 19000^2 + 42241^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2145302081 - 2⁶ = 2145302017 is a prime.

It is a super-2 number, since 2×2145302081² = 9204642037485861122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2145302081.

It is not an unprimeable number, because it can be changed into a prime (2145302581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2011946 + ... + 2013011.

It is an arithmetic number, because the mean of its divisors is an integer number (295834413).

Almost surely, 2^2145302081 is an apocalyptic number.

It is an amenable number.

2145302081 is a deficient number, since it is larger than the sum of its proper divisors (221373223).

2145302081 is a wasteful number, since it uses less digits than its factorization.

2145302081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4025011.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 2145302081 is about 46317.4058103430. The cubic root of 2145302081 is about 1289.7221285197.

Adding to 2145302081 its reverse (1802035412), we get a palindrome (3947337493).

The spelling of 2145302081 in words is "two billion, one hundred forty-five million, three hundred two thousand, eighty-one".