1974166217 has 2 divisors, whose sum is σ = 1974166218. Its totient is φ = 1974166216.

The previous prime is 1974166193. The next prime is 1974166247. The reversal of 1974166217 is 7126614791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1506914761 + 467251456 = 38819^2 + 21616^2 .

It is a cyclic number.

It is not a de Polignac number, because 1974166217 - 2⁸ = 1974165961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1974166247) 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, 987083108 + 987083109.

It is an arithmetic number, because the mean of its divisors is an integer number (987083109).

Almost surely, 2^1974166217 is an apocalyptic number.

It is an amenable number.

1974166217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1974166217 is an equidigital number, since it uses as much as digits as its factorization.

1974166217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 44.

The square root of 1974166217 is about 44431.5903046470. The cubic root of 1974166217 is about 1254.4727693383.

It can be divided in two parts, 19741 and 66217, that added together give a palindrome (85958).

The spelling of 1974166217 in words is "one billion, nine hundred seventy-four million, one hundred sixty-six thousand, two hundred seventeen".