42119381 has 2 divisors, whose sum is σ = 42119382. Its totient is φ = 42119380.

The previous prime is 42119369. The next prime is 42119383. The reversal of 42119381 is 18391124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38254225 + 3865156 = 6185^2 + 1966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42119381 is a prime.

It is a super-2 number, since 2×42119381² = 3548084511646322, which contains 22 as substring.

Together with 42119383, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_2554409 and since 42119381 and 2554409 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42119383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21059690 + 21059691.

It is an arithmetic number, because the mean of its divisors is an integer number (21059691).

Almost surely, 2^42119381 is an apocalyptic number.

It is an amenable number.

42119381 is a deficient number, since it is larger than the sum of its proper divisors (1).

42119381 is an equidigital number, since it uses as much as digits as its factorization.

42119381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 29.

The square root of 42119381 is about 6489.9446068514. The cubic root of 42119381 is about 347.9316954285.

The spelling of 42119381 in words is "forty-two million, one hundred nineteen thousand, three hundred eighty-one".