190989901 has 4 divisors (see below), whose sum is σ = 191537500. Its totient is φ = 190442304.

The previous prime is 190989833. The next prime is 190989923. The reversal of 190989901 is 109989091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 109989091 = 199 ⋅552709.

It can be written as a sum of positive squares in 2 ways, for example, as 102535876 + 88454025 = 10126^2 + 9405^2 .

It is a cyclic number.

It is not a de Polignac number, because 190989901 - 2¹³ = 190981709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190989941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273276 + ... + 273973.

It is an arithmetic number, because the mean of its divisors is an integer number (47884375).

Almost surely, 2^190989901 is an apocalyptic number.

It is an amenable number.

190989901 is a deficient number, since it is larger than the sum of its proper divisors (547599).

190989901 is an equidigital number, since it uses as much as digits as its factorization.

190989901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547598.

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 190989901 is about 13819.9095872585. The cubic root of 190989901 is about 575.8863718198.

It can be divided in two parts, 190989 and 901, that added together give a triangular number (191890 = T₆₁₉).

The spelling of 190989901 in words is "one hundred ninety million, nine hundred eighty-nine thousand, nine hundred one".