3885431621 has 2 divisors, whose sum is σ = 3885431622. Its totient is φ = 3885431620.

The previous prime is 3885431597. The next prime is 3885431623. The reversal of 3885431621 is 1261345883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2064702721 + 1820728900 = 45439^2 + 42670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3885431621 is a prime.

Together with 3885431623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3885431623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1942715810 + 1942715811.

It is an arithmetic number, because the mean of its divisors is an integer number (1942715811).

Almost surely, 2^3885431621 is an apocalyptic number.

It is an amenable number.

3885431621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3885431621 is an equidigital number, since it uses as much as digits as its factorization.

3885431621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 41.

The square root of 3885431621 is about 62333.2304713946. The cubic root of 3885431621 is about 1572.0985124582.

The spelling of 3885431621 in words is "three billion, eight hundred eighty-five million, four hundred thirty-one thousand, six hundred twenty-one".