213673545 has 84 divisors (see below), whose sum is σ = 403749828. Its totient is φ = 108475200.

The previous prime is 213673531. The next prime is 213673547. The reversal of 213673545 is 545376312.

213673545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 34327881 + 179345664 = 5859^2 + 13392^2 .

It is not a de Polignac number, because 213673545 - 2⁴ = 213673529 is a prime.

Its product of digits (75600) is a multiple of the sum of its prime divisors (100).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213673547) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 3502815 + ... + 3502875.

Almost surely, 2^213673545 is an apocalyptic number.

It is an amenable number.

213673545 is a deficient number, since it is larger than the sum of its proper divisors (190076283).

213673545 is an frugal number, since it uses more digits than its factorization.

213673545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 100 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The square root of 213673545 is about 14617.5765775316. The cubic root of 213673545 is about 597.8380946312.

The spelling of 213673545 in words is "two hundred thirteen million, six hundred seventy-three thousand, five hundred forty-five".