1320155013 has 4 divisors (see below), whose sum is σ = 1760206688. Its totient is φ = 880103340.

The previous prime is 1320154999. The next prime is 1320155041. The reversal of 1320155013 is 3105510231.

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 1320155013 - 2⁶ = 1320154949 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 (1320155413) 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, 220025833 + ... + 220025838.

It is an arithmetic number, because the mean of its divisors is an integer number (440051672).

Almost surely, 2^1320155013 is an apocalyptic number.

It is an amenable number.

1320155013 is a deficient number, since it is larger than the sum of its proper divisors (440051675).

1320155013 is an equidigital number, since it uses as much as digits as its factorization.

1320155013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440051674.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 1320155013 is about 36333.9374827447. The cubic root of 1320155013 is about 1097.0042490238.

Adding to 1320155013 its reverse (3105510231), we get a palindrome (4425665244).

The spelling of 1320155013 in words is "one billion, three hundred twenty million, one hundred fifty-five thousand, thirteen".