1091438505138 has 32 divisors (see below), whose sum is σ = 2306194364160. Its totient is φ = 343793784320.

The previous prime is 1091438505083. The next prime is 1091438505151. The reversal of 1091438505138 is 8315058341901.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66721983 + ... + 66738338.

It is an arithmetic number, because the mean of its divisors is an integer number (72068573880).

Almost surely, 2^{1091438505138} is an apocalyptic number.

1091438505138 is an abundant number, since it is smaller than the sum of its proper divisors (1214755859022).

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

1091438505138 is a wasteful number, since it uses less digits than its factorization.

1091438505138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133460402.

The product of its (nonzero) digits is 518400, while the sum is 48.

The spelling of 1091438505138 in words is "one trillion, ninety-one billion, four hundred thirty-eight million, five hundred five thousand, one hundred thirty-eight".