1023191 has 4 divisors (see below), whose sum is σ = 1101912. Its totient is φ = 944472.

The previous prime is 1023173. The next prime is 1023199. The reversal of 1023191 is 1913201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1023191 - 2¹⁰ = 1022167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39341 + ... + 39366.

It is an arithmetic number, because the mean of its divisors is an integer number (275478).

2^1023191 is an apocalyptic number.

1023191 is a deficient number, since it is larger than the sum of its proper divisors (78721).

1023191 is an equidigital number, since it uses as much as digits as its factorization.

1023191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78720.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1023191 is about 1011.5290406113. The cubic root of 1023191 is about 100.7671333491.

Adding to 1023191 its reverse (1913201), we get a palindrome (2936392).

The spelling of 1023191 in words is "one million, twenty-three thousand, one hundred ninety-one".