3997192321 has 2 divisors, whose sum is σ = 3997192322. Its totient is φ = 3997192320.

The previous prime is 3997192289. The next prime is 3997192327. The reversal of 3997192321 is 1232917993.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2605081600 + 1392110721 = 51040^2 + 37311^2 .

It is an emirp because it is prime and its reverse (1232917993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3997192321 - 2⁵ = 3997192289 is a prime.

It is a super-2 number, since 2×3997192321² = 31955092902122734082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3997192327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1998596160 + 1998596161.

It is an arithmetic number, because the mean of its divisors is an integer number (1998596161).

Almost surely, 2^3997192321 is an apocalyptic number.

It is an amenable number.

3997192321 is a deficient number, since it is larger than the sum of its proper divisors (1).

3997192321 is an equidigital number, since it uses as much as digits as its factorization.

3997192321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 46.

The square root of 3997192321 is about 63223.3526554864. The cubic root of 3997192321 is about 1587.0295556513.

The spelling of 3997192321 in words is "three billion, nine hundred ninety-seven million, one hundred ninety-two thousand, three hundred twenty-one".