3931199989 has 2 divisors, whose sum is σ = 3931199990. Its totient is φ = 3931199988.

The previous prime is 3931199981. The next prime is 3931200001. The reversal of 3931199989 is 9899911393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2935797489 + 995402500 = 54183^2 + 31550^2 .

It is a cyclic number.

It is not a de Polignac number, because 3931199989 - 2³ = 3931199981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3931199981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1965599994 + 1965599995.

It is an arithmetic number, because the mean of its divisors is an integer number (1965599995).

Almost surely, 2^3931199989 is an apocalyptic number.

It is an amenable number.

3931199989 is a deficient number, since it is larger than the sum of its proper divisors (1).

3931199989 is an equidigital number, since it uses as much as digits as its factorization.

3931199989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4251528, while the sum is 61.

The square root of 3931199989 is about 62699.2822048227. The cubic root of 3931199989 is about 1578.2472670993.

The spelling of 3931199989 in words is "three billion, nine hundred thirty-one million, one hundred ninety-nine thousand, nine hundred eighty-nine".