642220041 has 12 divisors (see below), whose sum is σ = 859114032. Its totient is φ = 426739968.

The previous prime is 642220039. The next prime is 642220057. The reversal of 642220041 is 140022246.

It is not a de Polignac number, because 642220041 - 2¹ = 642220039 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642220021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 998466 + ... + 999108.

It is an arithmetic number, because the mean of its divisors is an integer number (71592836).

Almost surely, 2^642220041 is an apocalyptic number.

It is an amenable number.

642220041 is a deficient number, since it is larger than the sum of its proper divisors (216893991).

642220041 is an frugal number, since it uses more digits than its factorization.

642220041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800 (or 1223 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 642220041 is about 25342.0607094214. The cubic root of 642220041 is about 862.7691705144.

Adding to 642220041 its reverse (140022246), we get a palindrome (782242287).

The spelling of 642220041 in words is "six hundred forty-two million, two hundred twenty thousand, forty-one".