190488821 has 2 divisors, whose sum is σ = 190488822. Its totient is φ = 190488820.

The previous prime is 190488817. The next prime is 190488847. The reversal of 190488821 is 128884091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167314225 + 23174596 = 12935^2 + 4814^2 .

It is a cyclic number.

It is not a de Polignac number, because 190488821 - 2² = 190488817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190488871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95244410 + 95244411.

It is an arithmetic number, because the mean of its divisors is an integer number (95244411).

Almost surely, 2^190488821 is an apocalyptic number.

It is an amenable number.

190488821 is a deficient number, since it is larger than the sum of its proper divisors (1).

190488821 is an equidigital number, since it uses as much as digits as its factorization.

190488821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 41.

The square root of 190488821 is about 13801.7687634593. The cubic root of 190488821 is about 575.3823000173.

The spelling of 190488821 in words is "one hundred ninety million, four hundred eighty-eight thousand, eight hundred twenty-one".