1181961041 has 4 divisors (see below), whose sum is σ = 1213905972. Its totient is φ = 1150016112.

The previous prime is 1181961017. The next prime is 1181961043. The reversal of 1181961041 is 1401691811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1401691811 = 13 ⋅107822447.

It can be written as a sum of positive squares in 2 ways, for example, as 599221441 + 582739600 = 24479^2 + 24140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181961041 - 2⁶ = 1181960977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1181960989 and 1181961007.

It is not an unprimeable number, because it can be changed into a prime (1181961043) 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, 15972410 + ... + 15972483.

It is an arithmetic number, because the mean of its divisors is an integer number (303476493).

Almost surely, 2^1181961041 is an apocalyptic number.

It is an amenable number.

1181961041 is a deficient number, since it is larger than the sum of its proper divisors (31944931).

1181961041 is an equidigital number, since it uses as much as digits as its factorization.

1181961041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31944930.

The product of its (nonzero) digits is 1728, while the sum is 32.

The square root of 1181961041 is about 34379.6602804623. The cubic root of 1181961041 is about 1057.3068696299.

The spelling of 1181961041 in words is "one billion, one hundred eighty-one million, nine hundred sixty-one thousand, forty-one".