1340113521 has 4 divisors (see below), whose sum is σ = 1786818032. Its totient is φ = 893409012.

The previous prime is 1340113507. The next prime is 1340113543. The reversal of 1340113521 is 1253110431.

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 1340113521 - 2⁶ = 1340113457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340115521) 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, 223352251 + ... + 223352256.

It is an arithmetic number, because the mean of its divisors is an integer number (446704508).

Almost surely, 2^1340113521 is an apocalyptic number.

It is an amenable number.

1340113521 is a deficient number, since it is larger than the sum of its proper divisors (446704511).

1340113521 is an equidigital number, since it uses as much as digits as its factorization.

1340113521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446704510.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1340113521 is about 36607.5609813055. The cubic root of 1340113521 is about 1102.5049033878.

Adding to 1340113521 its reverse (1253110431), we get a palindrome (2593223952).

The spelling of 1340113521 in words is "one billion, three hundred forty million, one hundred thirteen thousand, five hundred twenty-one".