1091901 has 4 divisors (see below), whose sum is σ = 1455872. Its totient is φ = 727932.

The previous prime is 1091887. The next prime is 1091917.

1091901 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1091901 - 2⁵ = 1091869 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091401) 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, 181981 + ... + 181986.

It is an arithmetic number, because the mean of its divisors is an integer number (363968).

2^1091901 is an apocalyptic number.

It is an amenable number.

1091901 is a deficient number, since it is larger than the sum of its proper divisors (363971).

1091901 is an equidigital number, since it uses as much as digits as its factorization.

1091901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363970.

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

The square root of 1091901 is about 1044.9406681721. The cubic root of 1091901 is about 102.9740406506.

The spelling of 1091901 in words is "one million, ninety-one thousand, nine hundred one".