3867071921 has 2 divisors, whose sum is σ = 3867071922. Its totient is φ = 3867071920.

The previous prime is 3867071849. The next prime is 3867071939. The reversal of 3867071921 is 1291707683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2410810000 + 1456261921 = 49100^2 + 38161^2 .

It is a cyclic number.

It is not a de Polignac number, because 3867071921 - 2¹⁰ = 3867070897 is a prime.

It is not a weakly prime, because it can be changed into another prime (3867071981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1933535960 + 1933535961.

It is an arithmetic number, because the mean of its divisors is an integer number (1933535961).

Almost surely, 2^3867071921 is an apocalyptic number.

It is an amenable number.

3867071921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3867071921 is an equidigital number, since it uses as much as digits as its factorization.

3867071921 is an evil number, because the sum of its binary digits is even.

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

The square root of 3867071921 is about 62185.7855220950. The cubic root of 3867071921 is about 1569.6184071318.

The spelling of 3867071921 in words is "three billion, eight hundred sixty-seven million, seventy-one thousand, nine hundred twenty-one".