3991597009 has 2 divisors, whose sum is σ = 3991597010. Its totient is φ = 3991597008.

The previous prime is 3991596997. The next prime is 3991597061. The reversal of 3991597009 is 9007951993.

It is an a-pointer prime, because the next prime (3991597061) can be obtained adding 3991597009 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3764190609 + 227406400 = 61353^2 + 15080^2 .

It is a cyclic number.

It is not a de Polignac number, because 3991597009 - 2¹³ = 3991588817 is a prime.

It is not a weakly prime, because it can be changed into another prime (3991597069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995798504 + 1995798505.

It is an arithmetic number, because the mean of its divisors is an integer number (1995798505).

Almost surely, 2^3991597009 is an apocalyptic number.

It is an amenable number.

3991597009 is a deficient number, since it is larger than the sum of its proper divisors (1).

3991597009 is an equidigital number, since it uses as much as digits as its factorization.

3991597009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 688905, while the sum is 52.

The square root of 3991597009 is about 63179.0868009344. The cubic root of 3991597009 is about 1586.2886962819.

The spelling of 3991597009 in words is "three billion, nine hundred ninety-one million, five hundred ninety-seven thousand, nine".