642611213 has 8 divisors (see below), whose sum is σ = 658616448. Its totient is φ = 626703264.

The previous prime is 642611209. The next prime is 642611219. The reversal of 642611213 is 312116246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642611213 - 2² = 642611209 is a prime.

It is a super-3 number, since 3×642611213³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642611219) 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, 10856 + ... + 37457.

It is an arithmetic number, because the mean of its divisors is an integer number (82327056).

Almost surely, 2^642611213 is an apocalyptic number.

It is an amenable number.

642611213 is a deficient number, since it is larger than the sum of its proper divisors (16005235).

642611213 is a wasteful number, since it uses less digits than its factorization.

642611213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48643.

The product of its digits is 1728, while the sum is 26.

The square root of 642611213 is about 25349.7773757483. Note that the first 3 decimals coincide. The cubic root of 642611213 is about 862.9443039694.

Adding to 642611213 its reverse (312116246), we get a palindrome (954727459).

The spelling of 642611213 in words is "six hundred forty-two million, six hundred eleven thousand, two hundred thirteen".