2123001653 has 2 divisors, whose sum is σ = 2123001654. Its totient is φ = 2123001652.

The previous prime is 2123001649. The next prime is 2123001677. The reversal of 2123001653 is 3561003212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1079582449 + 1043419204 = 32857^2 + 32302^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123001653 - 2² = 2123001649 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123001623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061500826 + 1061500827.

It is an arithmetic number, because the mean of its divisors is an integer number (1061500827).

Almost surely, 2^2123001653 is an apocalyptic number.

It is an amenable number.

2123001653 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123001653 is an equidigital number, since it uses as much as digits as its factorization.

2123001653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 2123001653 is about 46076.0420717752. The cubic root of 2123001653 is about 1285.2376640050.

Adding to 2123001653 its reverse (3561003212), we get a palindrome (5684004865).

The spelling of 2123001653 in words is "two billion, one hundred twenty-three million, one thousand, six hundred fifty-three".