1901191 has 2 divisors, whose sum is σ = 1901192. Its totient is φ = 1901190.

The previous prime is 1901177. The next prime is 1901201. The reversal of 1901191 is 1911091.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1901191 - 2¹³ = 1892999 is a prime.

It is a super-3 number, since 3×1901191³ = 20615719851093332613, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1901131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 950595 + 950596.

It is an arithmetic number, because the mean of its divisors is an integer number (950596).

2^1901191 is an apocalyptic number.

1901191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1901191 is an equidigital number, since it uses as much as digits as its factorization.

1901191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81, while the sum is 22.

The square root of 1901191 is about 1378.8368286349. The cubic root of 1901191 is about 123.8821069914.

The spelling of 1901191 in words is "one million, nine hundred one thousand, one hundred ninety-one".