190505801 has 4 divisors (see below), whose sum is σ = 190536900. Its totient is φ = 190474704.

The previous prime is 190505779. The next prime is 190505807. The reversal of 190505801 is 108505091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66406201 + 124099600 = 8149^2 + 11140^2 .

It is a cyclic number.

It is not a de Polignac number, because 190505801 - 2¹⁰ = 190504777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190505807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2966 + ... + 19743.

It is an arithmetic number, because the mean of its divisors is an integer number (47634225).

Almost surely, 2^190505801 is an apocalyptic number.

It is an amenable number.

190505801 is a deficient number, since it is larger than the sum of its proper divisors (31099).

190505801 is an equidigital number, since it uses as much as digits as its factorization.

190505801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31098.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 190505801 is about 13802.3838882999. The cubic root of 190505801 is about 575.3993958607.

The spelling of 190505801 in words is "one hundred ninety million, five hundred five thousand, eight hundred one".