1145235421 has 4 divisors (see below), whose sum is σ = 1249347744. Its totient is φ = 1041123100.

The previous prime is 1145235407. The next prime is 1145235437. The reversal of 1145235421 is 1245325411.

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 1145235421 - 2⁷ = 1145235293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1145235421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145233421) 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, 52056145 + ... + 52056166.

It is an arithmetic number, because the mean of its divisors is an integer number (312336936).

Almost surely, 2^1145235421 is an apocalyptic number.

1145235421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1145235421 is a deficient number, since it is larger than the sum of its proper divisors (104112323).

1145235421 is a wasteful number, since it uses less digits than its factorization.

1145235421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104112322.

The product of its digits is 4800, while the sum is 28.

The square root of 1145235421 is about 33841.3271164120. The cubic root of 1145235421 is about 1046.2406518913.

The spelling of 1145235421 in words is "one billion, one hundred forty-five million, two hundred thirty-five thousand, four hundred twenty-one".