161312717 has 4 divisors (see below), whose sum is σ = 169802880. Its totient is φ = 152822556.

The previous prime is 161312713. The next prime is 161312719. The reversal of 161312717 is 717213161.

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 161312717 - 2² = 161312713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161312717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161312713) 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, 4245053 + ... + 4245090.

It is an arithmetic number, because the mean of its divisors is an integer number (42450720).

Almost surely, 2^161312717 is an apocalyptic number.

It is an amenable number.

161312717 is a deficient number, since it is larger than the sum of its proper divisors (8490163).

161312717 is an equidigital number, since it uses as much as digits as its factorization.

161312717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8490162.

The product of its digits is 1764, while the sum is 29.

The square root of 161312717 is about 12700.8943385889. The cubic root of 161312717 is about 544.3641739110.

Adding to 161312717 its reverse (717213161), we get a palindrome (878525878).

The spelling of 161312717 in words is "one hundred sixty-one million, three hundred twelve thousand, seven hundred seventeen".