213531505 has 16 divisors (see below), whose sum is σ = 279936000. Its totient is φ = 155071360.

The previous prime is 213531499. The next prime is 213531523. The reversal of 213531505 is 505135312.

It is not a de Polignac number, because 213531505 - 2¹³ = 213523313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213531505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42096 + ... + 46894.

It is an arithmetic number, because the mean of its divisors is an integer number (17496000).

Almost surely, 2^213531505 is an apocalyptic number.

It is an amenable number.

213531505 is a deficient number, since it is larger than the sum of its proper divisors (66404495).

213531505 is a wasteful number, since it uses less digits than its factorization.

213531505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5624.

The product of its (nonzero) digits is 2250, while the sum is 25.

The square root of 213531505 is about 14612.7172353399. The cubic root of 213531505 is about 597.7055938325.

Adding to 213531505 its reverse (505135312), we get a palindrome (718666817).

The spelling of 213531505 in words is "two hundred thirteen million, five hundred thirty-one thousand, five hundred five".