19996513 has 2 divisors, whose sum is σ = 19996514. Its totient is φ = 19996512.

The previous prime is 19996489. The next prime is 19996541. The reversal of 19996513 is 31569991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19963024 + 33489 = 4468^2 + 183^2 .

It is a cyclic number.

It is not a de Polignac number, because 19996513 - 2⁹ = 19996001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19996513.

It is not a weakly prime, because it can be changed into another prime (19996583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9998256 + 9998257.

It is an arithmetic number, because the mean of its divisors is an integer number (9998257).

Almost surely, 2^19996513 is an apocalyptic number.

It is an amenable number.

19996513 is a deficient number, since it is larger than the sum of its proper divisors (1).

19996513 is an equidigital number, since it uses as much as digits as its factorization.

19996513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65610, while the sum is 43.

The square root of 19996513 is about 4471.7460795533. The cubic root of 19996513 is about 271.4259854522.

The spelling of 19996513 in words is "nineteen million, nine hundred ninety-six thousand, five hundred thirteen".