42671381 has 2 divisors, whose sum is σ = 42671382. Its totient is φ = 42671380.

The previous prime is 42671353. The next prime is 42671393. The reversal of 42671381 is 18317624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33466225 + 9205156 = 5785^2 + 3034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42671381 is a prime.

It is a super-2 number, since 2×42671381² = 3641693512894322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42671311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21335690 + 21335691.

It is an arithmetic number, because the mean of its divisors is an integer number (21335691).

Almost surely, 2^42671381 is an apocalyptic number.

It is an amenable number.

42671381 is a deficient number, since it is larger than the sum of its proper divisors (1).

42671381 is an equidigital number, since it uses as much as digits as its factorization.

42671381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 32.

The square root of 42671381 is about 6532.3335034274. Note that the first 3 decimals coincide. The cubic root of 42671381 is about 349.4450552627.

The spelling of 42671381 in words is "forty-two million, six hundred seventy-one thousand, three hundred eighty-one".