134904721 has 4 divisors (see below), whose sum is σ = 154176832. Its totient is φ = 115632612.

The previous prime is 134904709. The next prime is 134904751. The reversal of 134904721 is 127409431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127409431 = 2621 ⋅48611.

It is a cyclic number.

It is not a de Polignac number, because 134904721 - 2¹¹ = 134902673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (134904751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9636045 + ... + 9636058.

It is an arithmetic number, because the mean of its divisors is an integer number (38544208).

Almost surely, 2^134904721 is an apocalyptic number.

It is an amenable number.

134904721 is a deficient number, since it is larger than the sum of its proper divisors (19272111).

134904721 is an equidigital number, since it uses as much as digits as its factorization.

134904721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19272110.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 134904721 is about 11614.8491595888. The cubic root of 134904721 is about 512.8720705642.

The spelling of 134904721 in words is "one hundred thirty-four million, nine hundred four thousand, seven hundred twenty-one".