2161513 has 2 divisors, whose sum is σ = 2161514. Its totient is φ = 2161512.

The previous prime is 2161493. The next prime is 2161553. The reversal of 2161513 is 3151612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2050624 + 110889 = 1432^2 + 333^2 .

It is a cyclic number.

It is not a de Polignac number, because 2161513 - 2⁹ = 2161001 is a prime.

It is not a weakly prime, because it can be changed into another prime (2161553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080756 + 1080757.

It is an arithmetic number, because the mean of its divisors is an integer number (1080757).

2^2161513 is an apocalyptic number.

It is an amenable number.

2161513 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161513 is an equidigital number, since it uses as much as digits as its factorization.

2161513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 19.

The square root of 2161513 is about 1470.2084886165. The cubic root of 2161513 is about 129.2962563917.

Subtracting 2161513 from its reverse (3151612), we obtain a palindrome (990099).

The spelling of 2161513 in words is "two million, one hundred sixty-one thousand, five hundred thirteen".