213129491 has 8 divisors (see below), whose sum is σ = 214905600. Its totient is φ = 211360320.

The previous prime is 213129481. The next prime is 213129529. The reversal of 213129491 is 194921312.

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 213129491 - 2¹⁰ = 213128467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213129401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72590 + ... + 75468.

It is an arithmetic number, because the mean of its divisors is an integer number (26863200).

Almost surely, 2^213129491 is an apocalyptic number.

213129491 is a deficient number, since it is larger than the sum of its proper divisors (1776109).

213129491 is a wasteful number, since it uses less digits than its factorization.

213129491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3469.

The product of its digits is 3888, while the sum is 32.

The square root of 213129491 is about 14598.9551338443. The cubic root of 213129491 is about 597.3302597268.

It can be divided in two parts, 21312 and 9491, that added together give a palindrome (30803).

The spelling of 213129491 in words is "two hundred thirteen million, one hundred twenty-nine thousand, four hundred ninety-one".