1901091 has 8 divisors (see below), whose sum is σ = 2552400. Its totient is φ = 1258592.

The previous prime is 1901089. The next prime is 1901117.

1901091 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 1901091 - 2¹ = 1901089 is a prime.

It is a super-2 number, since 2×1901091² = 7228293980562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1901021) 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, 1680 + ... + 2573.

It is an arithmetic number, because the mean of its divisors is an integer number (319050).

2^1901091 is an apocalyptic number.

1901091 is a deficient number, since it is larger than the sum of its proper divisors (651309).

1901091 is a wasteful number, since it uses less digits than its factorization.

1901091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405.

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

The square root of 1901091 is about 1378.8005657092. The cubic root of 1901091 is about 123.8799349445.

The spelling of 1901091 in words is "one million, nine hundred one thousand, ninety-one".