642423151 has 2 divisors, whose sum is σ = 642423152. Its totient is φ = 642423150.

The previous prime is 642423127. The next prime is 642423179. The reversal of 642423151 is 151324246.

It is an a-pointer prime, because the next prime (642423179) can be obtained adding 642423151 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642423151 - 2²³ = 634034543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642423451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321211575 + 321211576.

It is an arithmetic number, because the mean of its divisors is an integer number (321211576).

Almost surely, 2^642423151 is an apocalyptic number.

642423151 is a deficient number, since it is larger than the sum of its proper divisors (1).

642423151 is an equidigital number, since it uses as much as digits as its factorization.

642423151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

The square root of 642423151 is about 25346.0677620810. The cubic root of 642423151 is about 862.8601147208.

Adding to 642423151 its reverse (151324246), we get a palindrome (793747397).

The spelling of 642423151 in words is "six hundred forty-two million, four hundred twenty-three thousand, one hundred fifty-one".