1181274225591 has 4 divisors (see below), whose sum is σ = 1575032300792. Its totient is φ = 787516150392.

The previous prime is 1181274225583. The next prime is 1181274225647. The reversal of 1181274225591 is 1955224721811.

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

It is not a de Polignac number, because 1181274225591 - 2³ = 1181274225583 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1181274225591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181274225541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196879037596 + ... + 196879037601.

It is an arithmetic number, because the mean of its divisors is an integer number (393758075198).

Almost surely, 2^{1181274225591} is an apocalyptic number.

1181274225591 is a deficient number, since it is larger than the sum of its proper divisors (393758075201).

1181274225591 is an equidigital number, since it uses as much as digits as its factorization.

1181274225591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393758075200.

The product of its digits is 403200, while the sum is 48.

The spelling of 1181274225591 in words is "one trillion, one hundred eighty-one billion, two hundred seventy-four million, two hundred twenty-five thousand, five hundred ninety-one".