9201661439 has 2 divisors, whose sum is σ = 9201661440. Its totient is φ = 9201661438.

The previous prime is 9201661379. The next prime is 9201661481. The reversal of 9201661439 is 9341661029.

It is a strong prime.

It is an emirp because it is prime and its reverse (9341661029) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9201661439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9201661396 and 9201661405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9201661489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4600830719 + 4600830720.

It is an arithmetic number, because the mean of its divisors is an integer number (4600830720).

Almost surely, 2^9201661439 is an apocalyptic number.

9201661439 is a deficient number, since it is larger than the sum of its proper divisors (1).

9201661439 is an equidigital number, since it uses as much as digits as its factorization.

9201661439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 9201661439 is about 95925.2909247608. The cubic root of 9201661439 is about 2095.5052344238.

The spelling of 9201661439 in words is "nine billion, two hundred one million, six hundred sixty-one thousand, four hundred thirty-nine".