642602171 has 2 divisors, whose sum is σ = 642602172. Its totient is φ = 642602170.

The previous prime is 642602141. The next prime is 642602201. The reversal of 642602171 is 171206246.

It is a balanced prime because it is at equal distance from previous prime (642602141) and next prime (642602201).

It is a cyclic number.

It is not a de Polignac number, because 642602171 - 2¹⁴ = 642585787 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (642602101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321301085 + 321301086.

It is an arithmetic number, because the mean of its divisors is an integer number (321301086).

Almost surely, 2^642602171 is an apocalyptic number.

642602171 is a deficient number, since it is larger than the sum of its proper divisors (1).

642602171 is an equidigital number, since it uses as much as digits as its factorization.

642602171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 642602171 is about 25349.5990303594. The cubic root of 642602171 is about 862.9402565356.

The spelling of 642602171 in words is "six hundred forty-two million, six hundred two thousand, one hundred seventy-one".