1863091 has 2 divisors, whose sum is σ = 1863092. Its totient is φ = 1863090.

The previous prime is 1863089. The next prime is 1863097. The reversal of 1863091 is 1903681.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1863091 - 2¹ = 1863089 is a prime.

It is a super-2 number, since 2×1863091² = 6942216148562, which contains 22 as substring.

Together with 1863089, 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 (1863097) 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, 931545 + 931546.

It is an arithmetic number, because the mean of its divisors is an integer number (931546).

2^1863091 is an apocalyptic number.

1863091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1863091 is an equidigital number, since it uses as much as digits as its factorization.

1863091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1863091 is about 1364.9509148684. The cubic root of 1863091 is about 123.0489813072.

It can be divided in two parts, 18630 and 91, that added together give a triangular number (18721 = T₁₉₃).

The spelling of 1863091 in words is "one million, eight hundred sixty-three thousand, ninety-one".