189897179 has 2 divisors, whose sum is σ = 189897180. Its totient is φ = 189897178.

The previous prime is 189897173. The next prime is 189897187. The reversal of 189897179 is 971798981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189897179 - 2¹⁶ = 189831643 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189897173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94948589 + 94948590.

It is an arithmetic number, because the mean of its divisors is an integer number (94948590).

Almost surely, 2^189897179 is an apocalyptic number.

189897179 is a deficient number, since it is larger than the sum of its proper divisors (1).

189897179 is an equidigital number, since it uses as much as digits as its factorization.

189897179 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 59.

The square root of 189897179 is about 13780.3185376826. The cubic root of 189897179 is about 574.7859861388.

The spelling of 189897179 in words is "one hundred eighty-nine million, eight hundred ninety-seven thousand, one hundred seventy-nine".