1209901 has 16 divisors (see below), whose sum is σ = 1589760. Its totient is φ = 892080.

The previous prime is 1209889. The next prime is 1209931. The reversal of 1209901 is 1099021.

It is not a de Polignac number, because 1209901 - 2⁷ = 1209773 is a prime.

It is an Ulam number.

It is a Duffinian number.

1209901 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209931) 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 15 ways as a sum of consecutive naturals, for example, 1050 + ... + 1876.

It is an arithmetic number, because the mean of its divisors is an integer number (99360).

2^1209901 is an apocalyptic number.

1209901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1209901 is a deficient number, since it is larger than the sum of its proper divisors (379859).

1209901 is a wasteful number, since it uses less digits than its factorization.

1209901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 1209901 is about 1099.9549990795. The cubic root of 1209901 is about 106.5573174095.

It can be divided in two parts, 1 and 209901, that added together give a palindrome (209902).

The spelling of 1209901 in words is "one million, two hundred nine thousand, nine hundred one".