213531155 has 8 divisors (see below), whose sum is σ = 257958000. Its totient is φ = 169677856.

The previous prime is 213531133. The next prime is 213531161. The reversal of 213531155 is 551135312.

It is a happy number.

213531155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213531155 - 2⁶ = 213531091 is a prime.

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, 142565 + ... + 144054.

It is an arithmetic number, because the mean of its divisors is an integer number (32244750).

Almost surely, 2^213531155 is an apocalyptic number.

213531155 is a deficient number, since it is larger than the sum of its proper divisors (44426845).

213531155 is a wasteful number, since it uses less digits than its factorization.

213531155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286773.

The product of its digits is 2250, while the sum is 26.

The square root of 213531155 is about 14612.7052594651. The cubic root of 213531155 is about 597.7052672654.

Adding to 213531155 its reverse (551135312), we get a palindrome (764666467).

The spelling of 213531155 in words is "two hundred thirteen million, five hundred thirty-one thousand, one hundred fifty-five".