2153909 has 2 divisors, whose sum is σ = 2153910. Its totient is φ = 2153908.

The previous prime is 2153903. The next prime is 2153929. The reversal of 2153909 is 9093512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1898884 + 255025 = 1378^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 2153909 - 2¹² = 2149813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2153903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076954 + 1076955.

It is an arithmetic number, because the mean of its divisors is an integer number (1076955).

2^2153909 is an apocalyptic number.

It is an amenable number.

2153909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2153909 is an equidigital number, since it uses as much as digits as its factorization.

2153909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 2153909 is about 1467.6201824723. The cubic root of 2153909 is about 129.1444608838.

The spelling of 2153909 in words is "two million, one hundred fifty-three thousand, nine hundred nine".