189778601 has 2 divisors, whose sum is σ = 189778602. Its totient is φ = 189778600.

The previous prime is 189778577. The next prime is 189778643. The reversal of 189778601 is 106877981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135373225 + 54405376 = 11635^2 + 7376^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189778601 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189778691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94889300 + 94889301.

It is an arithmetic number, because the mean of its divisors is an integer number (94889301).

Almost surely, 2^189778601 is an apocalyptic number.

It is an amenable number.

189778601 is a deficient number, since it is larger than the sum of its proper divisors (1).

189778601 is an equidigital number, since it uses as much as digits as its factorization.

189778601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 47.

The square root of 189778601 is about 13776.0154253688. The cubic root of 189778601 is about 574.6663228480. Note that the first 3 decimals are identical.

The spelling of 189778601 in words is "one hundred eighty-nine million, seven hundred seventy-eight thousand, six hundred one".