1147439521 has 4 divisors (see below), whose sum is σ = 1164565552. Its totient is φ = 1130313492.

The previous prime is 1147439519. The next prime is 1147439543. The reversal of 1147439521 is 1259347411.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1147439521 - 2¹ = 1147439519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1147439581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8562915 + ... + 8563048.

It is an arithmetic number, because the mean of its divisors is an integer number (291141388).

Almost surely, 2^1147439521 is an apocalyptic number.

It is an amenable number.

1147439521 is a deficient number, since it is larger than the sum of its proper divisors (17126031).

1147439521 is an equidigital number, since it uses as much as digits as its factorization.

1147439521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17126030.

The product of its digits is 30240, while the sum is 37.

The square root of 1147439521 is about 33873.8766751017. The cubic root of 1147439521 is about 1046.9114138976.

The spelling of 1147439521 in words is "one billion, one hundred forty-seven million, four hundred thirty-nine thousand, five hundred twenty-one".