2155513 has 2 divisors, whose sum is σ = 2155514. Its totient is φ = 2155512.

The previous prime is 2155511. The next prime is 2155519. The reversal of 2155513 is 3155512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1871424 + 284089 = 1368^2 + 533^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155513 - 2¹ = 2155511 is a prime.

Together with 2155511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2155511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077756 + 1077757.

It is an arithmetic number, because the mean of its divisors is an integer number (1077757).

2^2155513 is an apocalyptic number.

It is an amenable number.

2155513 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155513 is an equidigital number, since it uses as much as digits as its factorization.

2155513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 750, while the sum is 22.

The square root of 2155513 is about 1468.1665436864. The cubic root of 2155513 is about 129.1765105690.

Subtracting 2155513 from its reverse (3155512), we obtain a palindrome (999999).

The spelling of 2155513 in words is "two million, one hundred fifty-five thousand, five hundred thirteen".