642071 has 2 divisors, whose sum is σ = 642072. Its totient is φ = 642070.

The previous prime is 642049. The next prime is 642077. The reversal of 642071 is 170246.

642071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642071 - 2¹⁸ = 379927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321035 + 321036.

It is an arithmetic number, because the mean of its divisors is an integer number (321036).

2⁶⁴²⁰⁷¹ is an apocalyptic number.

642071 is a deficient number, since it is larger than the sum of its proper divisors (1).

642071 is an equidigital number, since it uses as much as digits as its factorization.

642071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 642071 is about 801.2933295617. The cubic root of 642071 is about 86.2702423958.

The spelling of 642071 in words is "six hundred forty-two thousand, seventy-one".