1591103 has 2 divisors, whose sum is σ = 1591104. Its totient is φ = 1591102.

The previous prime is 1591099. The next prime is 1591127. The reversal of 1591103 is 3011951.

It is a weak prime.

It is an emirp because it is prime and its reverse (3011951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1591103 - 2² = 1591099 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1597103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 795551 + 795552.

It is an arithmetic number, because the mean of its divisors is an integer number (795552).

2^1591103 is an apocalyptic number.

1591103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1591103 is an equidigital number, since it uses as much as digits as its factorization.

1591103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135, while the sum is 20.

The square root of 1591103 is about 1261.3893134160. The cubic root of 1591103 is about 116.7435149019.

The spelling of 1591103 in words is "one million, five hundred ninety-one thousand, one hundred three".