1990101 has 8 divisors (see below), whose sum is σ = 2693344. Its totient is φ = 1306800.

The previous prime is 1990081. The next prime is 1990103. The reversal of 1990101 is 1010991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1990101 - 2⁵ = 1990069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4750 + ... + 5151.

It is an arithmetic number, because the mean of its divisors is an integer number (336668).

2^1990101 is an apocalyptic number.

It is an amenable number.

1990101 is a deficient number, since it is larger than the sum of its proper divisors (703243).

1990101 is an equidigital number, since it uses as much as digits as its factorization.

1990101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9971.

The product of its (nonzero) digits is 81, while the sum is 21.

The square root of 1990101 is about 1410.7093960132. The cubic root of 1990101 is about 125.7838951246.

The spelling of 1990101 in words is "one million, nine hundred ninety thousand, one hundred one".