19499959 has 2 divisors, whose sum is σ = 19499960. Its totient is φ = 19499958.

The previous prime is 19499951. The next prime is 19499983. The reversal of 19499959 is 95999491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19499959 - 2³ = 19499951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19499951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9749979 + 9749980.

It is an arithmetic number, because the mean of its divisors is an integer number (9749980).

Almost surely, 2^19499959 is an apocalyptic number.

19499959 is a deficient number, since it is larger than the sum of its proper divisors (1).

19499959 is an equidigital number, since it uses as much as digits as its factorization.

19499959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1180980, while the sum is 55.

The square root of 19499959 is about 4415.8757908256. The cubic root of 19499959 is about 269.1604419617.

The spelling of 19499959 in words is "nineteen million, four hundred ninety-nine thousand, nine hundred fifty-nine".