134721813 has 16 divisors (see below), whose sum is σ = 183435840. Its totient is φ = 87919104.

The previous prime is 134721809. The next prime is 134721817. The reversal of 134721813 is 318127431.

It is an interprime number because it is at equal distance from previous prime (134721809) and next prime (134721817).

It is not a de Polignac number, because 134721813 - 2² = 134721809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (134721817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106378 + ... + 107636.

It is an arithmetic number, because the mean of its divisors is an integer number (11464740).

Almost surely, 2^134721813 is an apocalyptic number.

It is an amenable number.

134721813 is a deficient number, since it is larger than the sum of its proper divisors (48714027).

134721813 is a wasteful number, since it uses less digits than its factorization.

134721813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988.

The product of its digits is 4032, while the sum is 30.

The square root of 134721813 is about 11606.9726027074. The cubic root of 134721813 is about 512.6401764489.

The spelling of 134721813 in words is "one hundred thirty-four million, seven hundred twenty-one thousand, eight hundred thirteen".