1020109191 has 32 divisors (see below), whose sum is σ = 1504785600. Its totient is φ = 611788800.

The previous prime is 1020109187. The next prime is 1020109213. The reversal of 1020109191 is 1919010201.

It is not a de Polignac number, because 1020109191 - 2² = 1020109187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020109141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145965 + ... + 152793.

It is an arithmetic number, because the mean of its divisors is an integer number (47024550).

Almost surely, 2^1020109191 is an apocalyptic number.

1020109191 is a deficient number, since it is larger than the sum of its proper divisors (484676409).

1020109191 is a wasteful number, since it uses less digits than its factorization.

1020109191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6979.

The product of its (nonzero) digits is 162, while the sum is 24.

The square root of 1020109191 is about 31939.1482510101. The cubic root of 1020109191 is about 1006.6586279321.

Adding to 1020109191 its reverse (1919010201), we get a palindrome (2939119392).

The spelling of 1020109191 in words is "one billion, twenty million, one hundred nine thousand, one hundred ninety-one".