1313145421 has 4 divisors (see below), whose sum is σ = 1500737632. Its totient is φ = 1125553212.

The previous prime is 1313145403. The next prime is 1313145443. The reversal of 1313145421 is 1245413131.

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 not a de Polignac number, because 1313145421 - 2¹⁷ = 1313014349 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 (1313145401) 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, 93796095 + ... + 93796108.

It is an arithmetic number, because the mean of its divisors is an integer number (375184408).

Almost surely, 2^1313145421 is an apocalyptic number.

It is an amenable number.

1313145421 is a deficient number, since it is larger than the sum of its proper divisors (187592211).

1313145421 is an equidigital number, since it uses as much as digits as its factorization.

1313145421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187592210.

The product of its digits is 1440, while the sum is 25.

The square root of 1313145421 is about 36237.3484267268. The cubic root of 1313145421 is about 1095.0592243636.

Adding to 1313145421 its reverse (1245413131), we get a palindrome (2558558552).

The spelling of 1313145421 in words is "one billion, three hundred thirteen million, one hundred forty-five thousand, four hundred twenty-one".