1145521321 has 8 divisors (see below), whose sum is σ = 1315373504. Its totient is φ = 977220720.

The previous prime is 1145521309. The next prime is 1145521327. The reversal of 1145521321 is 1231255411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1145521321 - 2⁷ = 1145521193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1145521327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386310 + ... + 389263.

It is an arithmetic number, because the mean of its divisors is an integer number (164421688).

Almost surely, 2^1145521321 is an apocalyptic number.

It is an amenable number.

1145521321 is a deficient number, since it is larger than the sum of its proper divisors (169852183).

1145521321 is an equidigital number, since it uses as much as digits as its factorization.

1145521321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775791.

The product of its digits is 1200, while the sum is 25.

The square root of 1145521321 is about 33845.5509779350. The cubic root of 1145521321 is about 1046.3277068639.

Adding to 1145521321 its reverse (1231255411), we get a palindrome (2376776732).

The spelling of 1145521321 in words is "one billion, one hundred forty-five million, five hundred twenty-one thousand, three hundred twenty-one".