19955249 has 2 divisors, whose sum is σ = 19955250. Its totient is φ = 19955248.

The previous prime is 19955239. The next prime is 19955261. The reversal of 19955249 is 94255991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12475024 + 7480225 = 3532^2 + 2735^2 .

It is a cyclic number.

It is not a de Polignac number, because 19955249 - 2¹² = 19951153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19955209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9977624 + 9977625.

It is an arithmetic number, because the mean of its divisors is an integer number (9977625).

Almost surely, 2^19955249 is an apocalyptic number.

It is an amenable number.

19955249 is a deficient number, since it is larger than the sum of its proper divisors (1).

19955249 is an equidigital number, since it uses as much as digits as its factorization.

19955249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145800, while the sum is 44.

The square root of 19955249 is about 4467.1298391697. The cubic root of 19955249 is about 271.2391556326.

The spelling of 19955249 in words is "nineteen million, nine hundred fifty-five thousand, two hundred forty-nine".