2145204277 has 2 divisors, whose sum is σ = 2145204278. Its totient is φ = 2145204276.

The previous prime is 2145204251. The next prime is 2145204311. The reversal of 2145204277 is 7724025412.

It is an a-pointer prime, because the next prime (2145204311) can be obtained adding 2145204277 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1803361156 + 341843121 = 42466^2 + 18489^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145204277 - 2¹¹ = 2145202229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145204377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072602138 + 1072602139.

It is an arithmetic number, because the mean of its divisors is an integer number (1072602139).

Almost surely, 2^2145204277 is an apocalyptic number.

It is an amenable number.

2145204277 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145204277 is an equidigital number, since it uses as much as digits as its factorization.

2145204277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31360, while the sum is 34.

The square root of 2145204277 is about 46316.3499965185. The cubic root of 2145204277 is about 1289.7025288091.

Adding to 2145204277 its reverse (7724025412), we get a palindrome (9869229689).

The spelling of 2145204277 in words is "two billion, one hundred forty-five million, two hundred four thousand, two hundred seventy-seven".