1901009 has 8 divisors (see below), whose sum is σ = 2118528. Its totient is φ = 1690960.

The previous prime is 1900981. The next prime is 1901021. The reversal of 1901009 is 9001091.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1901009 is a prime.

It is a super-2 number, since 2×1901009² = 7227670436162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1901089) 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, 1322 + ... + 2355.

It is an arithmetic number, because the mean of its divisors is an integer number (264816).

2^1901009 is an apocalyptic number.

It is an amenable number.

1901009 is a deficient number, since it is larger than the sum of its proper divisors (217519).

1901009 is a wasteful number, since it uses less digits than its factorization.

1901009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3735.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 1901009 is about 1378.7708293984. The cubic root of 1901009 is about 123.8781538093.

The spelling of 1901009 in words is "one million, nine hundred one thousand, nine".