1974091169 has 2 divisors, whose sum is σ = 1974091170. Its totient is φ = 1974091168.

The previous prime is 1974091151. The next prime is 1974091181. The reversal of 1974091169 is 9611904791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1781852944 + 192238225 = 42212^2 + 13865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1974091169 is a prime.

It is a super-2 number, since 2×1974091169² = 7794071887047573122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1974091139) 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, 987045584 + 987045585.

It is an arithmetic number, because the mean of its divisors is an integer number (987045585).

Almost surely, 2^1974091169 is an apocalyptic number.

It is an amenable number.

1974091169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1974091169 is an equidigital number, since it uses as much as digits as its factorization.

1974091169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 1974091169 is about 44430.7457623660. The cubic root of 1974091169 is about 1254.4568728610.

The spelling of 1974091169 in words is "one billion, nine hundred seventy-four million, ninety-one thousand, one hundred sixty-nine".