1783196381 has 2 divisors, whose sum is σ = 1783196382. Its totient is φ = 1783196380.

The previous prime is 1783196377. The next prime is 1783196383. The reversal of 1783196381 is 1836913871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1134679225 + 648517156 = 33685^2 + 25466^2 .

It is a cyclic number.

It is not a de Polignac number, because 1783196381 - 2² = 1783196377 is a prime.

It is a super-2 number, since 2×1783196381² = 6359578666422994322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1783196383, 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 (1783196383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 891598190 + 891598191.

It is an arithmetic number, because the mean of its divisors is an integer number (891598191).

Almost surely, 2^1783196381 is an apocalyptic number.

It is an amenable number.

1783196381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1783196381 is an equidigital number, since it uses as much as digits as its factorization.

1783196381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The square root of 1783196381 is about 42227.9099766967. The cubic root of 1783196381 is about 1212.6432621455.

The spelling of 1783196381 in words is "one billion, seven hundred eighty-three million, one hundred ninety-six thousand, three hundred eighty-one".