163531607 has 4 divisors (see below), whose sum is σ = 165771840. Its totient is φ = 161291376.

The previous prime is 163531591. The next prime is 163531639. The reversal of 163531607 is 706135361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 706135361 = 19 ⋅37165019.

It is a cyclic number.

It is not a de Polignac number, because 163531607 - 2⁴ = 163531591 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 (163531307) 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, 1120007 + ... + 1120152.

It is an arithmetic number, because the mean of its divisors is an integer number (41442960).

Almost surely, 2^163531607 is an apocalyptic number.

163531607 is a deficient number, since it is larger than the sum of its proper divisors (2240233).

163531607 is an equidigital number, since it uses as much as digits as its factorization.

163531607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240232.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 163531607 is about 12787.9477243223. The cubic root of 163531607 is about 546.8487639854.

Adding to 163531607 its reverse (706135361), we get a palindrome (869666968).

The spelling of 163531607 in words is "one hundred sixty-three million, five hundred thirty-one thousand, six hundred seven".