2155539409 has 2 divisors, whose sum is σ = 2155539410. Its totient is φ = 2155539408.

The previous prime is 2155539359. The next prime is 2155539431. The reversal of 2155539409 is 9049355512.

2155539409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1093757184 + 1061782225 = 33072^2 + 32585^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155539409 - 2¹⁵ = 2155506641 is a prime.

It is not a weakly prime, because it can be changed into another prime (2155539439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077769704 + 1077769705.

It is an arithmetic number, because the mean of its divisors is an integer number (1077769705).

Almost surely, 2^2155539409 is an apocalyptic number.

It is an amenable number.

2155539409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155539409 is an equidigital number, since it uses as much as digits as its factorization.

2155539409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243000, while the sum is 43.

The square root of 2155539409 is about 46427.7870353520. The cubic root of 2155539409 is about 1291.7703811681.

The spelling of 2155539409 in words is "two billion, one hundred fifty-five million, five hundred thirty-nine thousand, four hundred nine".