642242631 has 8 divisors (see below), whose sum is σ = 856494720. Its totient is φ = 428076152.

The previous prime is 642242621. The next prime is 642242651. The reversal of 642242631 is 136242246.

642242631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 642242631 - 2⁶ = 642242567 is a prime.

It is a super-2 number, since 2×642242631² = 824951194147604322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642242621) 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, 1161 + ... + 35858.

It is an arithmetic number, because the mean of its divisors is an integer number (107061840).

Almost surely, 2^642242631 is an apocalyptic number.

642242631 is a deficient number, since it is larger than the sum of its proper divisors (214252089).

642242631 is a wasteful number, since it uses less digits than its factorization.

642242631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42805.

The product of its digits is 13824, while the sum is 30.

The square root of 642242631 is about 25342.5064072203. The cubic root of 642242631 is about 862.7792863241.

Adding to 642242631 its reverse (136242246), we get a palindrome (778484877).

The spelling of 642242631 in words is "six hundred forty-two million, two hundred forty-two thousand, six hundred thirty-one".