642182117 has 2 divisors, whose sum is σ = 642182118. Its totient is φ = 642182116.

The previous prime is 642182071. The next prime is 642182131. The reversal of 642182117 is 711281246.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 546904996 + 95277121 = 23386^2 + 9761^2 .

It is a cyclic number.

It is not a de Polignac number, because 642182117 - 2⁶ = 642182053 is a prime.

It is equal to p_33408059 and since 642182117 and 33408059 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642182147) 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 as a sum of consecutive naturals, namely, 321091058 + 321091059.

It is an arithmetic number, because the mean of its divisors is an integer number (321091059).

Almost surely, 2^642182117 is an apocalyptic number.

It is an amenable number.

642182117 is a deficient number, since it is larger than the sum of its proper divisors (1).

642182117 is an equidigital number, since it uses as much as digits as its factorization.

642182117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5376, while the sum is 32.

The square root of 642182117 is about 25341.3124561456. The cubic root of 642182117 is about 862.7521876010.

The spelling of 642182117 in words is "six hundred forty-two million, one hundred eighty-two thousand, one hundred seventeen".