2145573 has 6 divisors (see below), whose sum is σ = 3099174. Its totient is φ = 1430376.

The previous prime is 2145551. The next prime is 2145617. The reversal of 2145573 is 3755412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1340964 + 804609 = 1158^2 + 897^2 .

It is not a de Polignac number, because 2145573 - 2¹⁸ = 1883429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145173) 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, 119190 + ... + 119207.

It is an arithmetic number, because the mean of its divisors is an integer number (516529).

2^2145573 is an apocalyptic number.

It is an amenable number.

2145573 is a deficient number, since it is larger than the sum of its proper divisors (953601).

2145573 is a wasteful number, since it uses less digits than its factorization.

2145573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238403 (or 238400 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 2145573 is about 1464.7774574999. Note that the first 3 decimals coincide. The cubic root of 2145573 is about 128.9776416993.

It can be divided in two parts, 21455 and 73, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 2145573 in words is "two million, one hundred forty-five thousand, five hundred seventy-three".