161310617 has 4 divisors (see below), whose sum is σ = 173719140. Its totient is φ = 148902096.

The previous prime is 161310613. The next prime is 161310623. The reversal of 161310617 is 716013161.

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

It can be written as a sum of positive squares in 2 ways, for example, as 70375321 + 90935296 = 8389^2 + 9536^2 .

It is a cyclic number.

It is not a de Polignac number, because 161310617 - 2² = 161310613 is a prime.

It is a super-2 number, since 2×161310617² = 52042230313841378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161310613) 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, 6204242 + ... + 6204267.

It is an arithmetic number, because the mean of its divisors is an integer number (43429785).

Almost surely, 2^161310617 is an apocalyptic number.

It is an amenable number.

161310617 is a deficient number, since it is larger than the sum of its proper divisors (12408523).

161310617 is a wasteful number, since it uses less digits than its factorization.

161310617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12408522.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 161310617 is about 12700.8116669762. The cubic root of 161310617 is about 544.3618116882.

Adding to 161310617 its reverse (716013161), we get a palindrome (877323778).

The spelling of 161310617 in words is "one hundred sixty-one million, three hundred ten thousand, six hundred seventeen".