189657641 has 2 divisors, whose sum is σ = 189657642. Its totient is φ = 189657640.

The previous prime is 189657631. The next prime is 189657679. The reversal of 189657641 is 146756981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170041600 + 19616041 = 13040^2 + 4429^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189657641 is a prime.

It is not a weakly prime, because it can be changed into another prime (189657631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94828820 + 94828821.

It is an arithmetic number, because the mean of its divisors is an integer number (94828821).

Almost surely, 2^189657641 is an apocalyptic number.

It is an amenable number.

189657641 is a deficient number, since it is larger than the sum of its proper divisors (1).

189657641 is an equidigital number, since it uses as much as digits as its factorization.

189657641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 189657641 is about 13771.6244866029. The cubic root of 189657641 is about 574.5442043872.

The spelling of 189657641 in words is "one hundred eighty-nine million, six hundred fifty-seven thousand, six hundred forty-one".