161005617 has 16 divisors (see below), whose sum is σ = 239465280. Its totient is φ = 106914816.

The previous prime is 161005613. The next prime is 161005619. The reversal of 161005617 is 716500161.

It is not a de Polignac number, because 161005617 - 2² = 161005613 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (161005613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4663 + ... + 18540.

It is an arithmetic number, because the mean of its divisors is an integer number (14966580).

Almost surely, 2^161005617 is an apocalyptic number.

It is an amenable number.

161005617 is a deficient number, since it is larger than the sum of its proper divisors (78459663).

161005617 is a wasteful number, since it uses less digits than its factorization.

161005617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23469 (or 23463 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 161005617 is about 12688.7988793266. The cubic root of 161005617 is about 544.0185090030.

Adding to 161005617 its reverse (716500161), we get a palindrome (877505778).

The spelling of 161005617 in words is "one hundred sixty-one million, five thousand, six hundred seventeen".