42361381 has 2 divisors, whose sum is σ = 42361382. Its totient is φ = 42361380.

The previous prime is 42361367. The next prime is 42361391. The reversal of 42361381 is 18316324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27730756 + 14630625 = 5266^2 + 3825^2 .

It is a cyclic number.

It is not a de Polignac number, because 42361381 - 2⁵ = 42361349 is a prime.

It is a super-2 number, since 2×42361381² = 3588973200454322, 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 (42361391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21180690 + 21180691.

It is an arithmetic number, because the mean of its divisors is an integer number (21180691).

Almost surely, 2^42361381 is an apocalyptic number.

It is an amenable number.

42361381 is a deficient number, since it is larger than the sum of its proper divisors (1).

42361381 is an equidigital number, since it uses as much as digits as its factorization.

42361381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 42361381 is about 6508.5621299946. The cubic root of 42361381 is about 348.5967789996.

The spelling of 42361381 in words is "forty-two million, three hundred sixty-one thousand, three hundred eighty-one".