213128529 has 16 divisors (see below), whose sum is σ = 304776000. Its totient is φ = 132065856.

The previous prime is 213128521. The next prime is 213128533. The reversal of 213128529 is 925821312.

It is a happy number.

It is not a de Polignac number, because 213128529 - 2³ = 213128521 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 213128529.

It is not an unprimeable number, because it can be changed into a prime (213128521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32254 + ... + 38295.

It is an arithmetic number, because the mean of its divisors is an integer number (19048500).

Almost surely, 2^213128529 is an apocalyptic number.

It is an amenable number.

213128529 is a deficient number, since it is larger than the sum of its proper divisors (91647471).

213128529 is a wasteful number, since it uses less digits than its factorization.

213128529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70624.

The product of its digits is 8640, while the sum is 33.

The square root of 213128529 is about 14598.9221862438. The cubic root of 213128529 is about 597.3293610047.

The spelling of 213128529 in words is "two hundred thirteen million, one hundred twenty-eight thousand, five hundred twenty-nine".