1145633421 has 4 divisors (see below), whose sum is σ = 1527511232. Its totient is φ = 763755612.

The previous prime is 1145633407. The next prime is 1145633441. The reversal of 1145633421 is 1243365411.

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: 1243365411 = 3 ⋅414455137.

It is not a de Polignac number, because 1145633421 - 2⁵ = 1145633389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145633441) 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, 190938901 + ... + 190938906.

It is an arithmetic number, because the mean of its divisors is an integer number (381877808).

Almost surely, 2^1145633421 is an apocalyptic number.

It is an amenable number.

1145633421 is a deficient number, since it is larger than the sum of its proper divisors (381877811).

1145633421 is an equidigital number, since it uses as much as digits as its factorization.

1145633421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381877810.

The product of its digits is 8640, while the sum is 30.

The square root of 1145633421 is about 33847.2069896469. The cubic root of 1145633421 is about 1046.3618367423.

Adding to 1145633421 its reverse (1243365411), we get a palindrome (2388998832).

The spelling of 1145633421 in words is "one billion, one hundred forty-five million, six hundred thirty-three thousand, four hundred twenty-one".