1974491819 has 2 divisors, whose sum is σ = 1974491820. Its totient is φ = 1974491818.

The previous prime is 1974491801. The next prime is 1974491821. The reversal of 1974491819 is 9181944791.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1974491819 is a prime.

It is a super-2 number, since 2×1974491819² = 7797235886595857522, which contains 22 as substring.

Together with 1974491821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1974491219) 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, 987245909 + 987245910.

It is an arithmetic number, because the mean of its divisors is an integer number (987245910).

Almost surely, 2^1974491819 is an apocalyptic number.

1974491819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1974491819 is an equidigital number, since it uses as much as digits as its factorization.

1974491819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 53.

The square root of 1974491819 is about 44435.2542357980. The cubic root of 1974491819 is about 1254.5417328642.

The spelling of 1974491819 in words is "one billion, nine hundred seventy-four million, four hundred ninety-one thousand, eight hundred nineteen".