642187033 has 2 divisors, whose sum is σ = 642187034. Its totient is φ = 642187032.

The previous prime is 642187009. The next prime is 642187037. The reversal of 642187033 is 330781246.

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., 640950489 + 1236544 = 25317^2 + 1112^2 .

It is a cyclic number.

It is not a de Polignac number, because 642187033 - 2²¹ = 640089881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642187033.

It is not a weakly prime, because it can be changed into another prime (642187037) 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, 321093516 + 321093517.

It is an arithmetic number, because the mean of its divisors is an integer number (321093517).

Almost surely, 2^642187033 is an apocalyptic number.

It is an amenable number.

642187033 is a deficient number, since it is larger than the sum of its proper divisors (1).

642187033 is an equidigital number, since it uses as much as digits as its factorization.

642187033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 642187033 is about 25341.4094517255. The cubic root of 642187033 is about 862.7543890943.

The spelling of 642187033 in words is "six hundred forty-two million, one hundred eighty-seven thousand, thirty-three".