134566721 has 16 divisors (see below), whose sum is σ = 148391040. Its totient is φ = 121798512.

The previous prime is 134566697. The next prime is 134566739. The reversal of 134566721 is 127665431.

It is not a de Polignac number, because 134566721 - 2⁶ = 134566657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (134566771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157331 + ... + 158183.

It is an arithmetic number, because the mean of its divisors is an integer number (9274440).

Almost surely, 2^134566721 is an apocalyptic number.

It is an amenable number.

134566721 is a deficient number, since it is larger than the sum of its proper divisors (13824319).

134566721 is an frugal number, since it uses more digits than its factorization.

134566721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933 (or 895 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 134566721 is about 11600.2896946585. The cubic root of 134566721 is about 512.4433834741.

The spelling of 134566721 in words is "one hundred thirty-four million, five hundred sixty-six thousand, seven hundred twenty-one".