189205649 has 2 divisors, whose sum is σ = 189205650. Its totient is φ = 189205648.

The previous prime is 189205637. The next prime is 189205651. The reversal of 189205649 is 946502981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165508225 + 23697424 = 12865^2 + 4868^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189205649 is a prime.

It is a super-2 number, since 2×189205649² = 71597555227022402, which contains 22 as substring.

Together with 189205651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189205609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94602824 + 94602825.

It is an arithmetic number, because the mean of its divisors is an integer number (94602825).

Almost surely, 2^189205649 is an apocalyptic number.

It is an amenable number.

189205649 is a deficient number, since it is larger than the sum of its proper divisors (1).

189205649 is an equidigital number, since it uses as much as digits as its factorization.

189205649 is an evil number, because the sum of its binary digits is even.

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

The square root of 189205649 is about 13755.2044332318. The cubic root of 189205649 is about 574.0874235031.

The spelling of 189205649 in words is "one hundred eighty-nine million, two hundred five thousand, six hundred forty-nine".