1439663161 has 2 divisors, whose sum is σ = 1439663162. Its totient is φ = 1439663160.

The previous prime is 1439663131. The next prime is 1439663179. The reversal of 1439663161 is 1613669341.

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., 940587561 + 499075600 = 30669^2 + 22340^2 .

It is an emirp because it is prime and its reverse (1613669341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1439663161 - 2⁹ = 1439662649 is a prime.

It is not a weakly prime, because it can be changed into another prime (1439663101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719831580 + 719831581.

It is an arithmetic number, because the mean of its divisors is an integer number (719831581).

Almost surely, 2^1439663161 is an apocalyptic number.

It is an amenable number.

1439663161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1439663161 is an equidigital number, since it uses as much as digits as its factorization.

1439663161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 40.

The square root of 1439663161 is about 37942.8934189263. The cubic root of 1439663161 is about 1129.1551784479.

The spelling of 1439663161 in words is "one billion, four hundred thirty-nine million, six hundred sixty-three thousand, one hundred sixty-one".