1162591081261 has 4 divisors (see below), whose sum is σ = 1164634299900. Its totient is φ = 1160547862624.

The previous prime is 1162591081259. The next prime is 1162591081361. The reversal of 1162591081261 is 1621801952611.

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

It can be written as a sum of positive squares in 2 ways, for example, as 489566096100 + 673024985161 = 699690^2 + 820381^2 .

It is a cyclic number.

It is not a de Polignac number, because 1162591081261 - 2¹ = 1162591081259 is a prime.

It is a super-2 number, since 2×1162591081261² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1162591081361) 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, 1021608466 + ... + 1021609603.

It is an arithmetic number, because the mean of its divisors is an integer number (291158574975).

Almost surely, 2^{1162591081261} is an apocalyptic number.

It is an amenable number.

1162591081261 is a deficient number, since it is larger than the sum of its proper divisors (2043218639).

1162591081261 is an equidigital number, since it uses as much as digits as its factorization.

1162591081261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043218638.

The product of its (nonzero) digits is 51840, while the sum is 43.

The spelling of 1162591081261 in words is "one trillion, one hundred sixty-two billion, five hundred ninety-one million, eighty-one thousand, two hundred sixty-one".