213720537 has 8 divisors (see below), whose sum is σ = 285205536. Its totient is φ = 142357952.

The previous prime is 213720527. The next prime is 213720557. The reversal of 213720537 is 735027312.

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 213720537 - 2⁸ = 213720281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213720527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26448 + ... + 33569.

It is an arithmetic number, because the mean of its divisors is an integer number (35650692).

Almost surely, 2^213720537 is an apocalyptic number.

It is an amenable number.

213720537 is a deficient number, since it is larger than the sum of its proper divisors (71484999).

213720537 is a wasteful number, since it uses less digits than its factorization.

213720537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61207.

The product of its (nonzero) digits is 8820, while the sum is 30.

The square root of 213720537 is about 14619.1838691495. The cubic root of 213720537 is about 597.8819177891.

Adding to 213720537 its reverse (735027312), we get a palindrome (948747849).

The spelling of 213720537 in words is "two hundred thirteen million, seven hundred twenty thousand, five hundred thirty-seven".