19930609 has 2 divisors, whose sum is σ = 19930610. Its totient is φ = 19930608.

The previous prime is 19930583. The next prime is 19930637. The reversal of 19930609 is 90603991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18731584 + 1199025 = 4328^2 + 1095^2 .

It is a cyclic number.

It is not a de Polignac number, because 19930609 - 2⁵ = 19930577 is a prime.

It is a super-2 number, since 2×19930609² = 794458350221762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19930649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9965304 + 9965305.

It is an arithmetic number, because the mean of its divisors is an integer number (9965305).

Almost surely, 2^19930609 is an apocalyptic number.

It is an amenable number.

19930609 is a deficient number, since it is larger than the sum of its proper divisors (1).

19930609 is an equidigital number, since it uses as much as digits as its factorization.

19930609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 19930609 is about 4464.3710643270. The cubic root of 19930609 is about 271.1274709750.

The spelling of 19930609 in words is "nineteen million, nine hundred thirty thousand, six hundred nine".