213725491 has 4 divisors (see below), whose sum is σ = 244257712. Its totient is φ = 183193272.

The previous prime is 213725483. The next prime is 213725503. The reversal of 213725491 is 194527312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213725491 - 2³ = 213725483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213725441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15266100 + ... + 15266113.

It is an arithmetic number, because the mean of its divisors is an integer number (61064428).

Almost surely, 2^213725491 is an apocalyptic number.

213725491 is a deficient number, since it is larger than the sum of its proper divisors (30532221).

213725491 is an equidigital number, since it uses as much as digits as its factorization.

213725491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30532220.

The product of its digits is 15120, while the sum is 34.

The square root of 213725491 is about 14619.3533030706. The cubic root of 213725491 is about 597.8865373485.

The spelling of 213725491 in words is "two hundred thirteen million, seven hundred twenty-five thousand, four hundred ninety-one".