642100229 has 8 divisors (see below), whose sum is σ = 664066560. Its totient is φ = 620480016.

The previous prime is 642100211. The next prime is 642100237. The reversal of 642100229 is 922001246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642100229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 642100198 and 642100207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642102229) 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, 82754 + ... + 90179.

It is an arithmetic number, because the mean of its divisors is an integer number (83008320).

Almost surely, 2^642100229 is an apocalyptic number.

It is an amenable number.

642100229 is a deficient number, since it is larger than the sum of its proper divisors (21966331).

642100229 is a wasteful number, since it uses less digits than its factorization.

642100229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173059.

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

The square root of 642100229 is about 25339.6967029994. The cubic root of 642100229 is about 862.7155146944.

The spelling of 642100229 in words is "six hundred forty-two million, one hundred thousand, two hundred twenty-nine".