102011191 has 2 divisors, whose sum is σ = 102011192. Its totient is φ = 102011190.

The previous prime is 102011113. The next prime is 102011207. The reversal of 102011191 is 191110201.

It is an a-pointer prime, because the next prime (102011207) can be obtained adding 102011191 to its sum of digits (16).

It is a strong prime.

It is an emirp because it is prime and its reverse (191110201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102011191 - 2⁹ = 102010679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102011491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51005595 + 51005596.

It is an arithmetic number, because the mean of its divisors is an integer number (51005596).

Almost surely, 2^102011191 is an apocalyptic number.

102011191 is a deficient number, since it is larger than the sum of its proper divisors (1).

102011191 is an equidigital number, since it uses as much as digits as its factorization.

102011191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 16.

The square root of 102011191 is about 10100.0589602239. The cubic root of 102011191 is about 467.2499598024.

Adding to 102011191 its reverse (191110201), we get a palindrome (293121392).

The spelling of 102011191 in words is "one hundred two million, eleven thousand, one hundred ninety-one".