642378271 has 2 divisors, whose sum is σ = 642378272. Its totient is φ = 642378270.

The previous prime is 642378259. The next prime is 642378287. The reversal of 642378271 is 172873246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642378271 - 2¹⁹ = 641853983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642378211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321189135 + 321189136.

It is an arithmetic number, because the mean of its divisors is an integer number (321189136).

Almost surely, 2^642378271 is an apocalyptic number.

642378271 is a deficient number, since it is larger than the sum of its proper divisors (1).

642378271 is an equidigital number, since it uses as much as digits as its factorization.

642378271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 40.

The square root of 642378271 is about 25345.1824021844. The cubic root of 642378271 is about 862.8400209743.

The spelling of 642378271 in words is "six hundred forty-two million, three hundred seventy-eight thousand, two hundred seventy-one".