3891228973 has 2 divisors, whose sum is σ = 3891228974. Its totient is φ = 3891228972.

The previous prime is 3891228953. The next prime is 3891228983. The reversal of 3891228973 is 3798221983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3853553929 + 37675044 = 62077^2 + 6138^2 .

It is an emirp because it is prime and its reverse (3798221983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3891228973 - 2¹⁷ = 3891097901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3891228973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3891228953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945614486 + 1945614487.

It is an arithmetic number, because the mean of its divisors is an integer number (1945614487).

Almost surely, 2^3891228973 is an apocalyptic number.

It is an amenable number.

3891228973 is a deficient number, since it is larger than the sum of its proper divisors (1).

3891228973 is an equidigital number, since it uses as much as digits as its factorization.

3891228973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 52.

The square root of 3891228973 is about 62379.7160381482. The cubic root of 3891228973 is about 1572.8800197374.

The spelling of 3891228973 in words is "three billion, eight hundred ninety-one million, two hundred twenty-eight thousand, nine hundred seventy-three".