1134138721 has 4 divisors (see below), whose sum is σ = 1134206100. Its totient is φ = 1134071344.

The previous prime is 1134138683. The next prime is 1134138727. The reversal of 1134138721 is 1278314311.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1278314311 = 353 ⋅3621287.

It can be written as a sum of positive squares in 2 ways, for example, as 171898321 + 962240400 = 13111^2 + 31020^2 .

It is a cyclic number.

It is not a de Polignac number, because 1134138721 - 2⁹ = 1134138209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1134138727) 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, 15495 + ... + 50083.

It is an arithmetic number, because the mean of its divisors is an integer number (283551525).

Almost surely, 2^1134138721 is an apocalyptic number.

It is an amenable number.

1134138721 is a deficient number, since it is larger than the sum of its proper divisors (67379).

1134138721 is an equidigital number, since it uses as much as digits as its factorization.

1134138721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67378.

The product of its digits is 4032, while the sum is 31.

The square root of 1134138721 is about 33676.9761261310. The cubic root of 1134138721 is about 1042.8505135922.

The spelling of 1134138721 in words is "one billion, one hundred thirty-four million, one hundred thirty-eight thousand, seven hundred twenty-one".