1908101 has 4 divisors (see below), whose sum is σ = 2054892. Its totient is φ = 1761312.

The previous prime is 1908091. The next prime is 1908121. The reversal of 1908101 is 1018091.

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 1050625 + 857476 = 1025^2 + 926^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1908101 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 (1908121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73376 + ... + 73401.

It is an arithmetic number, because the mean of its divisors is an integer number (513723).

2^1908101 is an apocalyptic number.

It is an amenable number.

1908101 is a deficient number, since it is larger than the sum of its proper divisors (146791).

1908101 is a wasteful number, since it uses less digits than its factorization.

1908101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146790.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1908101 is about 1381.3402911665. The cubic root of 1908101 is about 124.0320113330.

Subtracting from 1908101 its sum of digits (20), we obtain a triangular number (1908081 = T₁₉₅₃).

The spelling of 1908101 in words is "one million, nine hundred eight thousand, one hundred one".