1230020653 has 4 divisors (see below), whose sum is σ = 1250184988. Its totient is φ = 1209856320.

The previous prime is 1230020647. The next prime is 1230020699. The reversal of 1230020653 is 3560200321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3560200321 = 47 ⋅75748943.

It can be written as a sum of positive squares in 2 ways, for example, as 262375204 + 967645449 = 16198^2 + 31107^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230020653 - 2⁵ = 1230020621 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 (1230020053) 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, 10082076 + ... + 10082197.

It is an arithmetic number, because the mean of its divisors is an integer number (312546247).

Almost surely, 2^1230020653 is an apocalyptic number.

It is an amenable number.

1230020653 is a deficient number, since it is larger than the sum of its proper divisors (20164335).

1230020653 is an equidigital number, since it uses as much as digits as its factorization.

1230020653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20164334.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 1230020653 is about 35071.6502748302. The cubic root of 1230020653 is about 1071.4472665343.

Adding to 1230020653 its reverse (3560200321), we get a palindrome (4790220974).

The spelling of 1230020653 in words is "one billion, two hundred thirty million, twenty thousand, six hundred fifty-three".