1453203121 has 4 divisors (see below), whose sum is σ = 1453361392. Its totient is φ = 1453044852.

The previous prime is 1453203119. The next prime is 1453203149. The reversal of 1453203121 is 1213023541.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1213023541 = 5351 ⋅226691.

It is a cyclic number.

It is not a de Polignac number, because 1453203121 - 2¹ = 1453203119 is a prime.

It is a super-2 number, since 2×1453203121² = 4223598621768281282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1453203092 and 1453203101.

It is not an unprimeable number, because it can be changed into a prime (1453203421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64455 + ... + 84028.

It is an arithmetic number, because the mean of its divisors is an integer number (363340348).

Almost surely, 2^1453203121 is an apocalyptic number.

It is an amenable number.

1453203121 is a deficient number, since it is larger than the sum of its proper divisors (158271).

1453203121 is an equidigital number, since it uses as much as digits as its factorization.

1453203121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158270.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1453203121 is about 38120.9013665732. The cubic root of 1453203121 is about 1132.6840212509.

Adding to 1453203121 its reverse (1213023541), we get a palindrome (2666226662).

The spelling of 1453203121 in words is "one billion, four hundred fifty-three million, two hundred three thousand, one hundred twenty-one".