642103931 has 8 divisors (see below), whose sum is σ = 734690304. Its totient is φ = 549731880.

The previous prime is 642103909. The next prime is 642103937. The reversal of 642103931 is 139301246.

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 642103931 - 2⁶ = 642103867 is a prime.

It is a super-2 number, since 2×642103931² = 824594916411305522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642103894 and 642103903.

It is not an unprimeable number, because it can be changed into a prime (642103937) 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, 47105 + ... + 59186.

It is an arithmetic number, because the mean of its divisors is an integer number (91836288).

Almost surely, 2^642103931 is an apocalyptic number.

642103931 is a deficient number, since it is larger than the sum of its proper divisors (92586373).

642103931 is a wasteful number, since it uses less digits than its factorization.

642103931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107161.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 642103931 is about 25339.7697503351. The cubic root of 642103931 is about 862.7171726737.

The spelling of 642103931 in words is "six hundred forty-two million, one hundred three thousand, nine hundred thirty-one".