134723521 has 4 divisors (see below), whose sum is σ = 142648452. Its totient is φ = 126798592.

The previous prime is 134723503. The next prime is 134723527. The reversal of 134723521 is 125327431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61449921 + 73273600 = 7839^2 + 8560^2 .

It is a cyclic number.

It is not a de Polignac number, because 134723521 - 2²¹ = 132626369 is a prime.

It is a super-2 number, since 2×134723521² = 36300854221274882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 134723521.

It is not an unprimeable number, because it can be changed into a prime (134723527) 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, 3962440 + ... + 3962473.

It is an arithmetic number, because the mean of its divisors is an integer number (35662113).

Almost surely, 2^134723521 is an apocalyptic number.

It is an amenable number.

134723521 is a deficient number, since it is larger than the sum of its proper divisors (7924931).

134723521 is an equidigital number, since it uses as much as digits as its factorization.

134723521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7924930.

The product of its digits is 5040, while the sum is 28.

The square root of 134723521 is about 11607.0461789380. The cubic root of 134723521 is about 512.6423428532.

The spelling of 134723521 in words is "one hundred thirty-four million, seven hundred twenty-three thousand, five hundred twenty-one".