1181454240961 has 4 divisors (see below), whose sum is σ = 1181890687792. Its totient is φ = 1181017794132.

The previous prime is 1181454240959. The next prime is 1181454240991. The reversal of 1181454240961 is 1690424541811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1181454240961 - 2¹ = 1181454240959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1181454240991) 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, 218219355 + ... + 218224768.

It is an arithmetic number, because the mean of its divisors is an integer number (295472671948).

Almost surely, 2^{1181454240961} is an apocalyptic number.

It is an amenable number.

1181454240961 is a deficient number, since it is larger than the sum of its proper divisors (436446831).

1181454240961 is an equidigital number, since it uses as much as digits as its factorization.

1181454240961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436446830.

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 1181454240961 in words is "one trillion, one hundred eighty-one billion, four hundred fifty-four million, two hundred forty thousand, nine hundred sixty-one".