3891229997 has 2 divisors, whose sum is σ = 3891229998. Its totient is φ = 3891229996.

The previous prime is 3891229967. The next prime is 3891230041. The reversal of 3891229997 is 7999221983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2857864681 + 1033365316 = 53459^2 + 32146^2 .

It is an emirp because it is prime and its reverse (7999221983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3891229997 - 2¹⁰ = 3891228973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3891229967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945614998 + 1945614999.

It is an arithmetic number, because the mean of its divisors is an integer number (1945614999).

Almost surely, 2^3891229997 is an apocalyptic number.

It is an amenable number.

3891229997 is a deficient number, since it is larger than the sum of its proper divisors (1).

3891229997 is an equidigital number, since it uses as much as digits as its factorization.

3891229997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 59.

The square root of 3891229997 is about 62379.7242459439. The cubic root of 3891229997 is about 1572.8801577083.

The spelling of 3891229997 in words is "three billion, eight hundred ninety-one million, two hundred twenty-nine thousand, nine hundred ninety-seven".