42641381 has 2 divisors, whose sum is σ = 42641382. Its totient is φ = 42641380.

The previous prime is 42641371. The next prime is 42641383. The reversal of 42641381 is 18314624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26368225 + 16273156 = 5135^2 + 4034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42641381 is a prime.

It is a super-2 number, since 2×42641381² = 3636574747174322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 42641383, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42641383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21320690 + 21320691.

It is an arithmetic number, because the mean of its divisors is an integer number (21320691).

Almost surely, 2^42641381 is an apocalyptic number.

It is an amenable number.

42641381 is a deficient number, since it is larger than the sum of its proper divisors (1).

42641381 is an equidigital number, since it uses as much as digits as its factorization.

42641381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 29.

The square root of 42641381 is about 6530.0368299115. The cubic root of 42641381 is about 349.3631439275.

The spelling of 42641381 in words is "forty-two million, six hundred forty-one thousand, three hundred eighty-one".