1902091 has 4 divisors (see below), whose sum is σ = 1906632. Its totient is φ = 1897552.

The previous prime is 1902053. The next prime is 1902097.

1902091 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1902091 - 2¹¹ = 1900043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1902097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1570 + ... + 2503.

It is an arithmetic number, because the mean of its divisors is an integer number (476658).

2^1902091 is an apocalyptic number.

1902091 is a deficient number, since it is larger than the sum of its proper divisors (4541).

1902091 is an equidigital number, since it uses as much as digits as its factorization.

1902091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4540.

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

The square root of 1902091 is about 1379.1631520600. The cubic root of 1902091 is about 123.9016519867.

The spelling of 1902091 in words is "one million, nine hundred two thousand, ninety-one".