1421191 has 2 divisors, whose sum is σ = 1421192. Its totient is φ = 1421190.

The previous prime is 1421159. The next prime is 1421213. The reversal of 1421191 is 1911241.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1421191 - 2⁵ = 1421159 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710595 + 710596.

It is an arithmetic number, because the mean of its divisors is an integer number (710596).

2^1421191 is an apocalyptic number.

1421191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421191 is an equidigital number, since it uses as much as digits as its factorization.

1421191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 19.

The square root of 1421191 is about 1192.1371565386. The cubic root of 1421191 is about 112.4305019316.

The spelling of 1421191 in words is "one million, four hundred twenty-one thousand, one hundred ninety-one".