67531213 has 4 divisors (see below), whose sum is σ = 67621180. Its totient is φ = 67441248.

The previous prime is 67531201. The next prime is 67531241. The reversal of 67531213 is 31213576.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29560969 + 37970244 = 5437^2 + 6162^2 .

It is a cyclic number.

It is not a de Polignac number, because 67531213 - 2¹³ = 67523021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67531283) 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, 43848 + ... + 45361.

It is an arithmetic number, because the mean of its divisors is an integer number (16905295).

Almost surely, 2^67531213 is an apocalyptic number.

It is an amenable number.

67531213 is a deficient number, since it is larger than the sum of its proper divisors (89967).

67531213 is an equidigital number, since it uses as much as digits as its factorization.

67531213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89966.

The product of its digits is 3780, while the sum is 28.

The square root of 67531213 is about 8217.7377057193. The cubic root of 67531213 is about 407.2253921641.

Adding to 67531213 its reverse (31213576), we get a palindrome (98744789).

The spelling of 67531213 in words is "sixty-seven million, five hundred thirty-one thousand, two hundred thirteen".