19135381 has 2 divisors, whose sum is σ = 19135382. Its totient is φ = 19135380.

The previous prime is 19135351. The next prime is 19135393. The reversal of 19135381 is 18353191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13176900 + 5958481 = 3630^2 + 2441^2 .

It is an emirp because it is prime and its reverse (18353191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19135381 - 2¹⁹ = 18611093 is a prime.

It is a super-2 number, since 2×19135381² = 732325612030322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19135351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9567690 + 9567691.

It is an arithmetic number, because the mean of its divisors is an integer number (9567691).

Almost surely, 2^19135381 is an apocalyptic number.

It is an amenable number.

19135381 is a deficient number, since it is larger than the sum of its proper divisors (1).

19135381 is an equidigital number, since it uses as much as digits as its factorization.

19135381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 31.

The square root of 19135381 is about 4374.4006446598. The cubic root of 19135381 is about 267.4724390040.

The spelling of 19135381 in words is "nineteen million, one hundred thirty-five thousand, three hundred eighty-one".