134157521 has 4 divisors (see below), whose sum is σ = 134933172. Its totient is φ = 133381872.

The previous prime is 134157511. The next prime is 134157559. The reversal of 134157521 is 125751431.

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 72063121 + 62094400 = 8489^2 + 7880^2 .

It is a cyclic number.

It is not a de Polignac number, because 134157521 - 2¹⁰ = 134156497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (134157511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387566 + ... + 387911.

It is an arithmetic number, because the mean of its divisors is an integer number (33733293).

Almost surely, 2^134157521 is an apocalyptic number.

It is an amenable number.

134157521 is a deficient number, since it is larger than the sum of its proper divisors (775651).

134157521 is an equidigital number, since it uses as much as digits as its factorization.

134157521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775650.

The product of its digits is 4200, while the sum is 29.

The square root of 134157521 is about 11582.6387753396. The cubic root of 134157521 is about 511.9234313905.

The spelling of 134157521 in words is "one hundred thirty-four million, one hundred fifty-seven thousand, five hundred twenty-one".