161506117 has 4 divisors (see below), whose sum is σ = 161532000. Its totient is φ = 161480236.

The previous prime is 161506109. The next prime is 161506123. The reversal of 161506117 is 711605161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 161506117 - 2³ = 161506109 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 (161506217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2808 + ... + 18190.

It is an arithmetic number, because the mean of its divisors is an integer number (40383000).

Almost surely, 2^161506117 is an apocalyptic number.

It is an amenable number.

161506117 is a deficient number, since it is larger than the sum of its proper divisors (25883).

161506117 is a wasteful number, since it uses less digits than its factorization.

161506117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25882.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 161506117 is about 12708.5056950060. The cubic root of 161506117 is about 544.5816355538.

The spelling of 161506117 in words is "one hundred sixty-one million, five hundred six thousand, one hundred seventeen".