161385317 has 4 divisors (see below), whose sum is σ = 161714496. Its totient is φ = 161056140.

The previous prime is 161385313. The next prime is 161385359. The reversal of 161385317 is 713583161.

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.

It is a cyclic number.

It is not a de Polignac number, because 161385317 - 2² = 161385313 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 (161385311) 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, 163853 + ... + 164834.

It is an arithmetic number, because the mean of its divisors is an integer number (40428624).

Almost surely, 2^161385317 is an apocalyptic number.

It is an amenable number.

161385317 is a deficient number, since it is larger than the sum of its proper divisors (329179).

161385317 is an equidigital number, since it uses as much as digits as its factorization.

161385317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329178.

The product of its digits is 15120, while the sum is 35.

The square root of 161385317 is about 12703.7520835382. The cubic root of 161385317 is about 544.4458267246.

The spelling of 161385317 in words is "one hundred sixty-one million, three hundred eighty-five thousand, three hundred seventeen".