1145232521 has 4 divisors (see below), whose sum is σ = 1145526912. Its totient is φ = 1144938132.

The previous prime is 1145232499. The next prime is 1145232577. The reversal of 1145232521 is 1252325411.

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: 1252325411 = 241 ⋅5196371.

It is a cyclic number.

It is not a de Polignac number, because 1145232521 - 2¹⁰ = 1145231497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1145232821) 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, 141281 + ... + 149166.

It is an arithmetic number, because the mean of its divisors is an integer number (286381728).

Almost surely, 2^1145232521 is an apocalyptic number.

It is an amenable number.

1145232521 is a deficient number, since it is larger than the sum of its proper divisors (294391).

1145232521 is an equidigital number, since it uses as much as digits as its factorization.

1145232521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294390.

The product of its digits is 2400, while the sum is 26.

The square root of 1145232521 is about 33841.2842693654. The cubic root of 1145232521 is about 1046.2397687831.

Adding to 1145232521 its reverse (1252325411), we get a palindrome (2397557932).

The spelling of 1145232521 in words is "one billion, one hundred forty-five million, two hundred thirty-two thousand, five hundred twenty-one".