1320106553 has 4 divisors (see below), whose sum is σ = 1320182388. Its totient is φ = 1320030720.

The previous prime is 1320106549. The next prime is 1320106577. The reversal of 1320106553 is 3556010231.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3556010231 = 1759 ⋅2021609.

It can be written as a sum of positive squares in 2 ways, for example, as 1039611049 + 280495504 = 32243^2 + 16748^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320106553 - 2² = 1320106549 is a prime.

It is a super-2 number, since 2×1320106553² = 3485362622547083618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320108553) 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, 2693 + ... + 51453.

It is an arithmetic number, because the mean of its divisors is an integer number (330045597).

Almost surely, 2^1320106553 is an apocalyptic number.

It is an amenable number.

1320106553 is a deficient number, since it is larger than the sum of its proper divisors (75835).

1320106553 is an equidigital number, since it uses as much as digits as its factorization.

1320106553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75834.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 1320106553 is about 36333.2706069795. The cubic root of 1320106553 is about 1096.9908259849.

Adding to 1320106553 its reverse (3556010231), we get a palindrome (4876116784).

The spelling of 1320106553 in words is "one billion, three hundred twenty million, one hundred six thousand, five hundred fifty-three".