642202089 has 4 divisors (see below), whose sum is σ = 856269456. Its totient is φ = 428134724.

The previous prime is 642202049. The next prime is 642202091. The reversal of 642202089 is 980202246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642202089 - 2¹² = 642197993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642202009) 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, 107033679 + ... + 107033684.

It is an arithmetic number, because the mean of its divisors is an integer number (214067364).

Almost surely, 2^642202089 is an apocalyptic number.

It is an amenable number.

642202089 is a deficient number, since it is larger than the sum of its proper divisors (214067367).

642202089 is a wasteful number, since it uses less digits than its factorization.

642202089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214067366.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 642202089 is about 25341.7065131770. The cubic root of 642202089 is about 862.7611314336.

The spelling of 642202089 in words is "six hundred forty-two million, two hundred two thousand, eighty-nine".