2145543377 has 2 divisors, whose sum is σ = 2145543378. Its totient is φ = 2145543376.

The previous prime is 2145543353. The next prime is 2145543397. The reversal of 2145543377 is 7733455412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1413083281 + 732460096 = 37591^2 + 27064^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145543377 - 2⁸ = 2145543121 is a prime.

It is not a weakly prime, because it can be changed into another prime (2145543397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072771688 + 1072771689.

It is an arithmetic number, because the mean of its divisors is an integer number (1072771689).

Almost surely, 2^2145543377 is an apocalyptic number.

It is an amenable number.

2145543377 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145543377 is an equidigital number, since it uses as much as digits as its factorization.

2145543377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 41.

The square root of 2145543377 is about 46320.0105461991. The cubic root of 2145543377 is about 1289.7704811700.

Adding to 2145543377 its reverse (7733455412), we get a palindrome (9878998789).

The spelling of 2145543377 in words is "two billion, one hundred forty-five million, five hundred forty-three thousand, three hundred seventy-seven".