19147949 has 2 divisors, whose sum is σ = 19147950. Its totient is φ = 19147948.

The previous prime is 19147939. The next prime is 19147957. The reversal of 19147949 is 94974191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18003049 + 1144900 = 4243^2 + 1070^2 .

It is a cyclic number.

It is not a de Polignac number, because 19147949 - 2²⁴ = 2370733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19147939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9573974 + 9573975.

It is an arithmetic number, because the mean of its divisors is an integer number (9573975).

Almost surely, 2^19147949 is an apocalyptic number.

It is an amenable number.

19147949 is a deficient number, since it is larger than the sum of its proper divisors (1).

19147949 is an equidigital number, since it uses as much as digits as its factorization.

19147949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 19147949 is about 4375.8369485162. The cubic root of 19147949 is about 267.5309842702.

The spelling of 19147949 in words is "nineteen million, one hundred forty-seven thousand, nine hundred forty-nine".