1153981687321 has 4 divisors (see below), whose sum is σ = 1154049878272. Its totient is φ = 1153913496372.

The previous prime is 1153981687307. The next prime is 1153981687357. The reversal of 1153981687321 is 1237861893511.

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 1153981687321 - 2¹³ = 1153981679129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1153981687421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34070085 + ... + 34103938.

It is an arithmetic number, because the mean of its divisors is an integer number (288512469568).

Almost surely, 2^{1153981687321} is an apocalyptic number.

It is an amenable number.

1153981687321 is a deficient number, since it is larger than the sum of its proper divisors (68190951).

1153981687321 is an equidigital number, since it uses as much as digits as its factorization.

1153981687321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68190950.

The product of its digits is 2177280, while the sum is 55.

The spelling of 1153981687321 in words is "one trillion, one hundred fifty-three billion, nine hundred eighty-one million, six hundred eighty-seven thousand, three hundred twenty-one".