4447691993 has 2 divisors, whose sum is σ = 4447691994. Its totient is φ = 4447691992.

The previous prime is 4447691987. The next prime is 4447692017. The reversal of 4447691993 is 3991967444.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2343818569 + 2103873424 = 48413^2 + 45868^2 .

It is a cyclic number.

It is not a de Polignac number, because 4447691993 - 2²⁰ = 4446643417 is a prime.

It is not a weakly prime, because it can be changed into another prime (4447691933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2223845996 + 2223845997.

It is an arithmetic number, because the mean of its divisors is an integer number (2223845997).

Almost surely, 2^4447691993 is an apocalyptic number.

It is an amenable number.

4447691993 is a deficient number, since it is larger than the sum of its proper divisors (1).

4447691993 is an equidigital number, since it uses as much as digits as its factorization.

4447691993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 56.

The square root of 4447691993 is about 66691.0188331232. The cubic root of 4447691993 is about 1644.5417425617.

The spelling of 4447691993 in words is "four billion, four hundred forty-seven million, six hundred ninety-one thousand, nine hundred ninety-three".