189959969 has 2 divisors, whose sum is σ = 189959970. Its totient is φ = 189959968.

The previous prime is 189959927. The next prime is 189959983. The reversal of 189959969 is 969959981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170041600 + 19918369 = 13040^2 + 4463^2 .

It is an emirp because it is prime and its reverse (969959981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189959969 - 2²⁴ = 173182753 is a prime.

It is a super-2 number, since 2×189959969² = 72169579644961922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (189959069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94979984 + 94979985.

It is an arithmetic number, because the mean of its divisors is an integer number (94979985).

Almost surely, 2^189959969 is an apocalyptic number.

It is an amenable number.

189959969 is a deficient number, since it is larger than the sum of its proper divisors (1).

189959969 is an equidigital number, since it uses as much as digits as its factorization.

189959969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14171760, while the sum is 65.

The square root of 189959969 is about 13782.5965986094. The cubic root of 189959969 is about 574.8493306553.

The spelling of 189959969 in words is "one hundred eighty-nine million, nine hundred fifty-nine thousand, nine hundred sixty-nine".