1091791759042 has 4 divisors (see below), whose sum is σ = 1637687638566. Its totient is φ = 545895879520.

The previous prime is 1091791759007. The next prime is 1091791759061. The reversal of 1091791759042 is 2409571971901.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 860662542961 + 231129216081 = 927719^2 + 480759^2 .

It is a super-2 number, since 2×1091791759042² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272947939759 + ... + 272947939762.

Almost surely, 2^{1091791759042} is an apocalyptic number.

1091791759042 is a deficient number, since it is larger than the sum of its proper divisors (545895879524).

1091791759042 is an equidigital number, since it uses as much as digits as its factorization.

1091791759042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545895879523.

The product of its (nonzero) digits is 1428840, while the sum is 55.

The spelling of 1091791759042 in words is "one trillion, ninety-one billion, seven hundred ninety-one million, seven hundred fifty-nine thousand, forty-two".