42164281 has 2 divisors, whose sum is σ = 42164282. Its totient is φ = 42164280.

The previous prime is 42164279. The next prime is 42164303. The reversal of 42164281 is 18246124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28355625 + 13808656 = 5325^2 + 3716^2 .

It is a cyclic number.

It is not a de Polignac number, because 42164281 - 2¹ = 42164279 is a prime.

It is a super-2 number, since 2×42164281² = 3555653184493922, which contains 22 as substring.

Together with 42164279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42164261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21082140 + 21082141.

It is an arithmetic number, because the mean of its divisors is an integer number (21082141).

Almost surely, 2^42164281 is an apocalyptic number.

It is an amenable number.

42164281 is a deficient number, since it is larger than the sum of its proper divisors (1).

42164281 is an equidigital number, since it uses as much as digits as its factorization.

42164281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 28.

The square root of 42164281 is about 6493.4028829266. The cubic root of 42164281 is about 348.0552852889.

The spelling of 42164281 in words is "forty-two million, one hundred sixty-four thousand, two hundred eighty-one".