1311521453 has 4 divisors (see below), whose sum is σ = 1430750688. Its totient is φ = 1192292220.

The previous prime is 1311521447. The next prime is 1311521473. The reversal of 1311521453 is 3541251131.

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 1311521453 - 2⁴ = 1311521437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311521473) 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, 59614601 + ... + 59614622.

It is an arithmetic number, because the mean of its divisors is an integer number (357687672).

Almost surely, 2^1311521453 is an apocalyptic number.

It is an amenable number.

1311521453 is a deficient number, since it is larger than the sum of its proper divisors (119229235).

1311521453 is a wasteful number, since it uses less digits than its factorization.

1311521453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119229234.

The product of its digits is 1800, while the sum is 26.

The square root of 1311521453 is about 36214.9341156380. The cubic root of 1311521453 is about 1094.6076179367.

Adding to 1311521453 its reverse (3541251131), we get a palindrome (4852772584).

The spelling of 1311521453 in words is "one billion, three hundred eleven million, five hundred twenty-one thousand, four hundred fifty-three".