1319145521 has 4 divisors (see below), whose sum is σ = 1351319844. Its totient is φ = 1286971200.

The previous prime is 1319145493. The next prime is 1319145523. The reversal of 1319145521 is 1255419131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1255419131 = 33911 ⋅37021.

It can be written as a sum of positive squares in 2 ways, for example, as 505755121 + 813390400 = 22489^2 + 28520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1319145521 - 2²² = 1314951217 is a prime.

It is a super-2 number, since 2×1319145521² = 3480289811148722882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1319145523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16087100 + ... + 16087181.

It is an arithmetic number, because the mean of its divisors is an integer number (337829961).

Almost surely, 2^1319145521 is an apocalyptic number.

It is an amenable number.

1319145521 is a deficient number, since it is larger than the sum of its proper divisors (32174323).

1319145521 is an equidigital number, since it uses as much as digits as its factorization.

1319145521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32174322.

The product of its digits is 5400, while the sum is 32.

The square root of 1319145521 is about 36320.0429652830. The cubic root of 1319145521 is about 1096.7245597968.

The spelling of 1319145521 in words is "one billion, three hundred nineteen million, one hundred forty-five thousand, five hundred twenty-one".