102040191 has 48 divisors (see below), whose sum is σ = 167525280. Its totient is φ = 59304960.

The previous prime is 102040187. The next prime is 102040201. The reversal of 102040191 is 191040201.

It is not a de Polignac number, because 102040191 - 2² = 102040187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102040181) 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 in 47 ways as a sum of consecutive naturals, for example, 325851 + ... + 326163.

It is an arithmetic number, because the mean of its divisors is an integer number (3490110).

Almost surely, 2^102040191 is an apocalyptic number.

102040191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

102040191 is a deficient number, since it is larger than the sum of its proper divisors (65485089).

102040191 is a wasteful number, since it uses less digits than its factorization.

102040191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 102040191 is about 10101.4944933906. The cubic root of 102040191 is about 467.2942326084.

Adding to 102040191 its reverse (191040201), we get a palindrome (293080392).

The spelling of 102040191 in words is "one hundred two million, forty thousand, one hundred ninety-one".