189402569 has 2 divisors, whose sum is σ = 189402570. Its totient is φ = 189402568.

The previous prime is 189402557. The next prime is 189402571. The reversal of 189402569 is 965204981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153462544 + 35940025 = 12388^2 + 5995^2 .

It is a cyclic number.

It is not a de Polignac number, because 189402569 - 2⁴ = 189402553 is a prime.

It is a super-2 number, since 2×189402569² = 71746666287599522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 189402571, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (189402589) 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, 94701284 + 94701285.

It is an arithmetic number, because the mean of its divisors is an integer number (94701285).

Almost surely, 2^189402569 is an apocalyptic number.

It is an amenable number.

189402569 is a deficient number, since it is larger than the sum of its proper divisors (1).

189402569 is an equidigital number, since it uses as much as digits as its factorization.

189402569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 189402569 is about 13762.3605896663. The cubic root of 189402569 is about 574.2865192122.

The spelling of 189402569 in words is "one hundred eighty-nine million, four hundred two thousand, five hundred sixty-nine".