20161513 has 2 divisors, whose sum is σ = 20161514. Its totient is φ = 20161512.

The previous prime is 20161487. The next prime is 20161523. The reversal of 20161513 is 31516102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10445824 + 9715689 = 3232^2 + 3117^2 .

It is a cyclic number.

It is not a de Polignac number, because 20161513 - 2¹³ = 20153321 is a prime.

It is not a weakly prime, because it can be changed into another prime (20161523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10080756 + 10080757.

It is an arithmetic number, because the mean of its divisors is an integer number (10080757).

Almost surely, 2^20161513 is an apocalyptic number.

It is an amenable number.

20161513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20161513 is an equidigital number, since it uses as much as digits as its factorization.

20161513 is an evil number, because the sum of its binary digits is even.

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

The square root of 20161513 is about 4490.1573469089. The cubic root of 20161513 is about 272.1704930600.

Adding to 20161513 its reverse (31516102), we get a palindrome (51677615).

The spelling of 20161513 in words is "twenty million, one hundred sixty-one thousand, five hundred thirteen".