1213816453 has 4 divisors (see below), whose sum is σ = 1225160640. Its totient is φ = 1202472268.

The previous prime is 1213816451. The next prime is 1213816459. The reversal of 1213816453 is 3546183121.

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 1213816453 - 2¹ = 1213816451 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 (1213816451) 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, 5671933 + ... + 5672146.

It is an arithmetic number, because the mean of its divisors is an integer number (306290160).

Almost surely, 2^1213816453 is an apocalyptic number.

It is an amenable number.

1213816453 is a deficient number, since it is larger than the sum of its proper divisors (11344187).

1213816453 is a wasteful number, since it uses less digits than its factorization.

1213816453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11344186.

The product of its digits is 17280, while the sum is 34.

The square root of 1213816453 is about 34839.8687282257. The cubic root of 1213816453 is about 1066.7213972677.

Adding to 1213816453 its reverse (3546183121), we get a palindrome (4759999574).

The spelling of 1213816453 in words is "one billion, two hundred thirteen million, eight hundred sixteen thousand, four hundred fifty-three".