1091123998434 has 128 divisors (see below), whose sum is σ = 2508578242560. Its totient is φ = 351353851200.

The previous prime is 1091123998417. The next prime is 1091123998477. The reversal of 1091123998434 is 4348993211901.

1091123998434 is a `hidden beast` number, since 1 + 0 + 9 + 112 + 3 + 9 + 98 + 434 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 81293044 + ... + 81306464.

It is an arithmetic number, because the mean of its divisors is an integer number (19598267520).

Almost surely, 2^{1091123998434} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091123998434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1254289121280).

1091123998434 is an abundant number, since it is smaller than the sum of its proper divisors (1417454244126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091123998434 is a wasteful number, since it uses less digits than its factorization.

1091123998434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13893 (or 13887 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 1091123998434 in words is "one trillion, ninety-one billion, one hundred twenty-three million, nine hundred ninety-eight thousand, four hundred thirty-four".