19975513 has 2 divisors, whose sum is σ = 19975514. Its totient is φ = 19975512.

The previous prime is 19975499. The next prime is 19975531. The reversal of 19975513 is 31557991.

Together with next prime (19975531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13564489 + 6411024 = 3683^2 + 2532^2 .

It is a cyclic number.

It is not a de Polignac number, because 19975513 - 2¹⁷ = 19844441 is a prime.

It is a super-2 number, since 2×19975513² = 798042239226338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19975913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9987756 + 9987757.

It is an arithmetic number, because the mean of its divisors is an integer number (9987757).

Almost surely, 2^19975513 is an apocalyptic number.

It is an amenable number.

19975513 is a deficient number, since it is larger than the sum of its proper divisors (1).

19975513 is an equidigital number, since it uses as much as digits as its factorization.

19975513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42525, while the sum is 40.

The square root of 19975513 is about 4469.3973866731. The cubic root of 19975513 is about 271.3309365106.

The spelling of 19975513 in words is "nineteen million, nine hundred seventy-five thousand, five hundred thirteen".