1242163453 has 4 divisors (see below), whose sum is σ = 1242249148. Its totient is φ = 1242077760.

The previous prime is 1242163441. The next prime is 1242163471. The reversal of 1242163453 is 3543612421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3543612421 = 233 ⋅15208637.

It can be written as a sum of positive squares in 2 ways, for example, as 972317124 + 269846329 = 31182^2 + 16427^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242163453 - 2⁹ = 1242162941 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 (1242167453) 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, 15126 + ... + 52087.

It is an arithmetic number, because the mean of its divisors is an integer number (310562287).

Almost surely, 2^1242163453 is an apocalyptic number.

It is an amenable number.

1242163453 is a deficient number, since it is larger than the sum of its proper divisors (85695).

1242163453 is an equidigital number, since it uses as much as digits as its factorization.

1242163453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85694.

The product of its digits is 17280, while the sum is 31.

The square root of 1242163453 is about 35244.3393043479. The cubic root of 1242163453 is about 1074.9615138196.

Adding to 1242163453 its reverse (3543612421), we get a palindrome (4785775874).

The spelling of 1242163453 in words is "one billion, two hundred forty-two million, one hundred sixty-three thousand, four hundred fifty-three".