1945091 has 2 divisors, whose sum is σ = 1945092. Its totient is φ = 1945090.

The previous prime is 1945061. The next prime is 1945093. The reversal of 1945091 is 1905491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1945091 - 2¹⁰ = 1944067 is a prime.

Together with 1945093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1945093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972545 + 972546.

It is an arithmetic number, because the mean of its divisors is an integer number (972546).

2^1945091 is an apocalyptic number.

1945091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945091 is an equidigital number, since it uses as much as digits as its factorization.

1945091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 1945091 is about 1394.6651927972. The cubic root of 1945091 is about 124.8283724597.

The spelling of 1945091 in words is "one million, nine hundred forty-five thousand, ninety-one".