3891541229 has 2 divisors, whose sum is σ = 3891541230. Its totient is φ = 3891541228.

The previous prime is 3891541223. The next prime is 3891541261. The reversal of 3891541229 is 9221451983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2275099204 + 1616442025 = 47698^2 + 40205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3891541229 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3891541229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3891541223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945770614 + 1945770615.

It is an arithmetic number, because the mean of its divisors is an integer number (1945770615).

Almost surely, 2^3891541229 is an apocalyptic number.

It is an amenable number.

3891541229 is a deficient number, since it is larger than the sum of its proper divisors (1).

3891541229 is an equidigital number, since it uses as much as digits as its factorization.

3891541229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 3891541229 is about 62382.2188528109. The cubic root of 3891541229 is about 1572.9220911147.

The spelling of 3891541229 in words is "three billion, eight hundred ninety-one million, five hundred forty-one thousand, two hundred twenty-nine".