213531506 has 16 divisors (see below), whose sum is σ = 326550528. Its totient is φ = 104697600.

The previous prime is 213531499. The next prime is 213531523. The reversal of 213531506 is 605135312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23186 + ... + 31058.

It is an arithmetic number, because the mean of its divisors is an integer number (20409408).

Almost surely, 2^213531506 is an apocalyptic number.

213531506 is a deficient number, since it is larger than the sum of its proper divisors (113019022).

213531506 is a wasteful number, since it uses less digits than its factorization.

213531506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8137.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 213531506 is about 14612.7172695567. The cubic root of 213531506 is about 597.7055947655.

Adding to 213531506 its reverse (605135312), we get a palindrome (818666818).

The spelling of 213531506 in words is "two hundred thirteen million, five hundred thirty-one thousand, five hundred six".