189208381 has 2 divisors, whose sum is σ = 189208382. Its totient is φ = 189208380.

The previous prime is 189208337. The next prime is 189208391. The reversal of 189208381 is 183802981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157904356 + 31304025 = 12566^2 + 5595^2 .

It is a cyclic number.

It is not a de Polignac number, because 189208381 - 2²⁷ = 54990653 is a prime.

It is a super-2 number, since 2×189208381² = 71599622881282322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189208301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94604190 + 94604191.

It is an arithmetic number, because the mean of its divisors is an integer number (94604191).

Almost surely, 2^189208381 is an apocalyptic number.

It is an amenable number.

189208381 is a deficient number, since it is larger than the sum of its proper divisors (1).

189208381 is an equidigital number, since it uses as much as digits as its factorization.

189208381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 189208381 is about 13755.3037407394. The cubic root of 189208381 is about 574.0901866329.

The spelling of 189208381 in words is "one hundred eighty-nine million, two hundred eight thousand, three hundred eighty-one".