42611213 has 4 divisors (see below), whose sum is σ = 42882780. Its totient is φ = 42339648.

The previous prime is 42611209. The next prime is 42611221. The reversal of 42611213 is 31211624.

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 22915369 + 19695844 = 4787^2 + 4438^2 .

It is a cyclic number.

It is not a de Polignac number, because 42611213 - 2² = 42611209 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 (42011213) 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, 135548 + ... + 135861.

It is an arithmetic number, because the mean of its divisors is an integer number (10720695).

Almost surely, 2^42611213 is an apocalyptic number.

It is an amenable number.

42611213 is a deficient number, since it is larger than the sum of its proper divisors (271567).

42611213 is a wasteful number, since it uses less digits than its factorization.

42611213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271566.

The product of its digits is 288, while the sum is 20.

The square root of 42611213 is about 6527.7264801767. The cubic root of 42611213 is about 349.2807351376.

Adding to 42611213 its reverse (31211624), we get a palindrome (73822837).

It can be divided in two parts, 426112 and 13, that multiplied together give a triangular number (5539456 = T₃₃₂₈).

The spelling of 42611213 in words is "forty-two million, six hundred eleven thousand, two hundred thirteen".