163501331 has 8 divisors (see below), whose sum is σ = 190026240. Its totient is φ = 137768328.

The previous prime is 163501313. The next prime is 163501337. The reversal of 163501331 is 133105361.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163501331 - 2¹⁴ = 163484947 is a prime.

It is a super-2 number, since 2×163501331² = 53465370477543122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163501297 and 163501306.

It is not an unprimeable number, because it can be changed into a prime (163501337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197531 + ... + 198356.

It is an arithmetic number, because the mean of its divisors is an integer number (23753280).

Almost surely, 2^163501331 is an apocalyptic number.

163501331 is a deficient number, since it is larger than the sum of its proper divisors (26524909).

163501331 is an equidigital number, since it uses as much as digits as its factorization.

163501331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395953.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 163501331 is about 12786.7638986571. The cubic root of 163501331 is about 546.8150143120.

Adding to 163501331 its reverse (133105361), we get a palindrome (296606692).

The spelling of 163501331 in words is "one hundred sixty-three million, five hundred one thousand, three hundred thirty-one".