3991915001 has 2 divisors, whose sum is σ = 3991915002. Its totient is φ = 3991915000.

The previous prime is 3991914977. The next prime is 3991915009. The reversal of 3991915001 is 1005191993.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3609125776 + 382789225 = 60076^2 + 19565^2 .

It is a cyclic number.

It is not a de Polignac number, because 3991915001 - 2¹⁰ = 3991913977 is a prime.

It is not a weakly prime, because it can be changed into another prime (3991915009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995957500 + 1995957501.

It is an arithmetic number, because the mean of its divisors is an integer number (1995957501).

Almost surely, 2^3991915001 is an apocalyptic number.

It is an amenable number.

3991915001 is a deficient number, since it is larger than the sum of its proper divisors (1).

3991915001 is an equidigital number, since it uses as much as digits as its factorization.

3991915001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10935, while the sum is 38.

The square root of 3991915001 is about 63181.6033430618. The cubic root of 3991915001 is about 1586.3308192483.

The spelling of 3991915001 in words is "three billion, nine hundred ninety-one million, nine hundred fifteen thousand, one".