134109721 has 4 divisors (see below), whose sum is σ = 134132944. Its totient is φ = 134086500.

The previous prime is 134109697. The next prime is 134109761. The reversal of 134109721 is 127901431.

134109721 = T₉₄₅₄ + T₉₄₅₅ + T₉₄₅₆.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-134109721 is a prime.

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 134109721.

It is not an unprimeable number, because it can be changed into a prime (134109761) 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, 4546 + ... + 16996.

It is an arithmetic number, because the mean of its divisors is an integer number (33533236).

Almost surely, 2^134109721 is an apocalyptic number.

134109721 is the 9456-th centered triangular number.

It is an amenable number.

134109721 is a deficient number, since it is larger than the sum of its proper divisors (23223).

134109721 is a wasteful number, since it uses less digits than its factorization.

134109721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23222.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 134109721 is about 11580.5751584280. The cubic root of 134109721 is about 511.8626251417.

The spelling of 134109721 in words is "one hundred thirty-four million, one hundred nine thousand, seven hundred twenty-one".