1215253453 has 4 divisors (see below), whose sum is σ = 1215429148. Its totient is φ = 1215077760.

The previous prime is 1215253447. The next prime is 1215253511. The reversal of 1215253453 is 3543525121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 856264644 + 358988809 = 29262^2 + 18947^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215253453 - 2⁵ = 1215253421 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 (1215253153) 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, 77028 + ... + 91453.

It is an arithmetic number, because the mean of its divisors is an integer number (303857287).

Almost surely, 2^1215253453 is an apocalyptic number.

It is an amenable number.

1215253453 is a deficient number, since it is larger than the sum of its proper divisors (175695).

1215253453 is an equidigital number, since it uses as much as digits as its factorization.

1215253453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175694.

The product of its digits is 18000, while the sum is 31.

The square root of 1215253453 is about 34860.4855531302. The cubic root of 1215253453 is about 1067.1421841536.

Adding to 1215253453 its reverse (3543525121), we get a palindrome (4758778574).

The spelling of 1215253453 in words is "one billion, two hundred fifteen million, two hundred fifty-three thousand, four hundred fifty-three".