1191374805547 has 16 divisors (see below), whose sum is σ = 1251361343232. Its totient is φ = 1132092380320.

The previous prime is 1191374805541. The next prime is 1191374805583. The reversal of 1191374805547 is 7455084731911.

It is not a de Polignac number, because 1191374805547 - 2²⁷ = 1191240587819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1191374805541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2159388 + ... + 2654374.

It is an arithmetic number, because the mean of its divisors is an integer number (78210083952).

Almost surely, 2^{1191374805547} is an apocalyptic number.

1191374805547 is a deficient number, since it is larger than the sum of its proper divisors (59986537685).

1191374805547 is a wasteful number, since it uses less digits than its factorization.

1191374805547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495698.

The product of its (nonzero) digits is 4233600, while the sum is 55.

The spelling of 1191374805547 in words is "one trillion, one hundred ninety-one billion, three hundred seventy-four million, eight hundred five thousand, five hundred forty-seven".