1091000191010 has 16 divisors (see below), whose sum is σ = 1971441594936. Its totient is φ = 434702020608.

The previous prime is 1091000190997. The next prime is 1091000191033. The reversal of 1091000191010 is 101910001901.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1026106194961 + 64893996049 = 1012969^2 + 254743^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212254277 + ... + 212259416.

Almost surely, 2^{1091000191010} is an apocalyptic number.

1091000191010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1091000191010 is a deficient number, since it is larger than the sum of its proper divisors (880441403926).

1091000191010 is a wasteful number, since it uses less digits than its factorization.

1091000191010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424513957.

The product of its (nonzero) digits is 81, while the sum is 23.

Adding to 1091000191010 its reverse (101910001901), we get a palindrome (1192910192911).

The spelling of 1091000191010 in words is "one trillion, ninety-one billion, one hundred ninety-one thousand, ten".