1020191020191 has 12 divisors (see below), whose sum is σ = 1684124858832. Its totient is φ = 582966297216.

The previous prime is 1020191020187. The next prime is 1020191020201. The reversal of 1020191020191 is 1910201910201.

It is not a de Polignac number, because 1020191020191 - 2² = 1020191020187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020191020111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8096754066 + ... + 8096754191.

It is an arithmetic number, because the mean of its divisors is an integer number (140343738236).

Almost surely, 2^{1020191020191} is an apocalyptic number.

1020191020191 is a deficient number, since it is larger than the sum of its proper divisors (663933838641).

1020191020191 is a wasteful number, since it uses less digits than its factorization.

1020191020191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16193508270 (or 16193508267 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

Adding to 1020191020191 its reverse (1910201910201), we get a palindrome (2930392930392).

The spelling of 1020191020191 in words is "one trillion, twenty billion, one hundred ninety-one million, twenty thousand, one hundred ninety-one".