1091288120901 has 32 divisors (see below), whose sum is σ = 1599649261056. Its totient is φ = 656254248000.

The previous prime is 1091288120863. The next prime is 1091288120927. The reversal of 1091288120901 is 1090218821901.

It is a happy number.

It is not a de Polignac number, because 1091288120901 - 2¹⁹ = 1091287596613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091288120101) 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, 58251706 + ... + 58270436.

It is an arithmetic number, because the mean of its divisors is an integer number (49989039408).

Almost surely, 2^{1091288120901} is an apocalyptic number.

1091288120901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1091288120901 is a deficient number, since it is larger than the sum of its proper divisors (508361140155).

1091288120901 is a wasteful number, since it uses less digits than its factorization.

1091288120901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32353.

The product of its (nonzero) digits is 20736, while the sum is 42.

The spelling of 1091288120901 in words is "one trillion, ninety-one billion, two hundred eighty-eight million, one hundred twenty thousand, nine hundred one".