19115381 has 2 divisors, whose sum is σ = 19115382. Its totient is φ = 19115380.

The previous prime is 19115363. The next prime is 19115423. The reversal of 19115381 is 18351191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12013156 + 7102225 = 3466^2 + 2665^2 .

It is an emirp because it is prime and its reverse (18351191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19115381 - 2¹⁴ = 19098997 is a prime.

It is a super-2 number, since 2×19115381² = 730795581550322, which contains 22 as substring.

It is a Sophie Germain prime.

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 (19115081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9557690 + 9557691.

It is an arithmetic number, because the mean of its divisors is an integer number (9557691).

Almost surely, 2^19115381 is an apocalyptic number.

It is an amenable number.

19115381 is a deficient number, since it is larger than the sum of its proper divisors (1).

19115381 is an equidigital number, since it uses as much as digits as its factorization.

19115381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 29.

The square root of 19115381 is about 4372.1140195562. The cubic root of 19115381 is about 267.3792205207.

The spelling of 19115381 in words is "nineteen million, one hundred fifteen thousand, three hundred eighty-one".