134259721 has 6 divisors (see below), whose sum is σ = 135903770. Its totient is φ = 132635328.

The previous prime is 134259709. The next prime is 134259731. The reversal of 134259721 is 127952431.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 75951225 + 58308496 = 8715^2 + 7636^2 .

It is a de Polignac number, because none of the positive numbers 2^k-134259721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (134259731) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2856 + ... + 16633.

Almost surely, 2^134259721 is an apocalyptic number.

It is an amenable number.

134259721 is a deficient number, since it is larger than the sum of its proper divisors (1644049).

134259721 is an frugal number, since it uses more digits than its factorization.

134259721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19655 (or 19572 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

The square root of 134259721 is about 11587.0497107763. The cubic root of 134259721 is about 512.0533912929.

The spelling of 134259721 in words is "one hundred thirty-four million, two hundred fifty-nine thousand, seven hundred twenty-one".