189904541 has 2 divisors, whose sum is σ = 189904542. Its totient is φ = 189904540.

The previous prime is 189904493. The next prime is 189904549. The reversal of 189904541 is 145409981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184824025 + 5080516 = 13595^2 + 2254^2 .

It is a cyclic number.

It is not a de Polignac number, because 189904541 - 2²⁶ = 122795677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189904549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94952270 + 94952271.

It is an arithmetic number, because the mean of its divisors is an integer number (94952271).

Almost surely, 2^189904541 is an apocalyptic number.

It is an amenable number.

189904541 is a deficient number, since it is larger than the sum of its proper divisors (1).

189904541 is an equidigital number, since it uses as much as digits as its factorization.

189904541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 189904541 is about 13780.5856551890. The cubic root of 189904541 is about 574.7934138773.

The spelling of 189904541 in words is "one hundred eighty-nine million, nine hundred four thousand, five hundred forty-one".