1023111191 has 2 divisors, whose sum is σ = 1023111192. Its totient is φ = 1023111190.

The previous prime is 1023111163. The next prime is 1023111227. The reversal of 1023111191 is 1911113201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023111191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1023111151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511555595 + 511555596.

It is an arithmetic number, because the mean of its divisors is an integer number (511555596).

Almost surely, 2^1023111191 is an apocalyptic number.

1023111191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023111191 is an equidigital number, since it uses as much as digits as its factorization.

1023111191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 20.

The square root of 1023111191 is about 31986.1093445264. The cubic root of 1023111191 is about 1007.6451333221.

Adding to 1023111191 its reverse (1911113201), we get a palindrome (2934224392).

The spelling of 1023111191 in words is "one billion, twenty-three million, one hundred eleven thousand, one hundred ninety-one".