2145423173 has 2 divisors, whose sum is σ = 2145423174. Its totient is φ = 2145423172.

The previous prime is 2145423127. The next prime is 2145423221. The reversal of 2145423173 is 3713245412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2145357124 + 66049 = 46318^2 + 257^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145423173 - 2⁶ = 2145423109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145423073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072711586 + 1072711587.

It is an arithmetic number, because the mean of its divisors is an integer number (1072711587).

Almost surely, 2^2145423173 is an apocalyptic number.

It is an amenable number.

2145423173 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145423173 is an equidigital number, since it uses as much as digits as its factorization.

2145423173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 32.

The square root of 2145423173 is about 46318.7129894603. The cubic root of 2145423173 is about 1289.7463942700.

Adding to 2145423173 its reverse (3713245412), we get a palindrome (5858668585).

The spelling of 2145423173 in words is "two billion, one hundred forty-five million, four hundred twenty-three thousand, one hundred seventy-three".