163464721 has 4 divisors (see below), whose sum is σ = 186816832. Its totient is φ = 140112612.

The previous prime is 163464683. The next prime is 163464727. The reversal of 163464721 is 127464361.

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, and also an emirpimes, since its reverse is a distinct semiprime: 127464361 = 4447 ⋅28663.

It is a cyclic number.

It is not a de Polignac number, because 163464721 - 2¹³ = 163456529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163464727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11676045 + ... + 11676058.

It is an arithmetic number, because the mean of its divisors is an integer number (46704208).

Almost surely, 2^163464721 is an apocalyptic number.

It is an amenable number.

163464721 is a deficient number, since it is larger than the sum of its proper divisors (23352111).

163464721 is an equidigital number, since it uses as much as digits as its factorization.

163464721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23352110.

The product of its digits is 24192, while the sum is 34.

The square root of 163464721 is about 12785.3322600549. The cubic root of 163464721 is about 546.7741983506.

The spelling of 163464721 in words is "one hundred sixty-three million, four hundred sixty-four thousand, seven hundred twenty-one".