161009647 has 4 divisors (see below), whose sum is σ = 161135656. Its totient is φ = 160883640.

The previous prime is 161009609. The next prime is 161009657. The reversal of 161009647 is 746900161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161009647 - 2¹⁹ = 160485359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161009657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61068 + ... + 63649.

It is an arithmetic number, because the mean of its divisors is an integer number (40283914).

Almost surely, 2^161009647 is an apocalyptic number.

161009647 is a deficient number, since it is larger than the sum of its proper divisors (126009).

161009647 is a wasteful number, since it uses less digits than its factorization.

161009647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126008.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 161009647 is about 12688.9576798096. The cubic root of 161009647 is about 544.0230479260.

The spelling of 161009647 in words is "one hundred sixty-one million, nine thousand, six hundred forty-seven".