19772149 has 2 divisors, whose sum is σ = 19772150. Its totient is φ = 19772148.

The previous prime is 19772069. The next prime is 19772153. The reversal of 19772149 is 94127791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13089924 + 6682225 = 3618^2 + 2585^2 .

It is an emirp because it is prime and its reverse (94127791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19772149 - 2¹⁵ = 19739381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19772549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9886074 + 9886075.

It is an arithmetic number, because the mean of its divisors is an integer number (9886075).

Almost surely, 2^19772149 is an apocalyptic number.

It is an amenable number.

19772149 is a deficient number, since it is larger than the sum of its proper divisors (1).

19772149 is an equidigital number, since it uses as much as digits as its factorization.

19772149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 40.

The square root of 19772149 is about 4446.5884675783. The cubic root of 19772149 is about 270.4070175825.

The spelling of 19772149 in words is "nineteen million, seven hundred seventy-two thousand, one hundred forty-nine".