2153989 has 2 divisors, whose sum is σ = 2153990. Its totient is φ = 2153988.

The previous prime is 2153981. The next prime is 2153993. The reversal of 2153989 is 9893512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1361889 + 792100 = 1167^2 + 890^2 .

It is a cyclic number.

It is not a de Polignac number, because 2153989 - 2³ = 2153981 is a prime.

It is a super-2 number, since 2×2153989² = 9279337224242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2153981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076994 + 1076995.

It is an arithmetic number, because the mean of its divisors is an integer number (1076995).

2^2153989 is an apocalyptic number.

It is an amenable number.

2153989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2153989 is an equidigital number, since it uses as much as digits as its factorization.

2153989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The square root of 2153989 is about 1467.6474372273. The cubic root of 2153989 is about 129.1460597488.

The spelling of 2153989 in words is "two million, one hundred fifty-three thousand, nine hundred eighty-nine".