1145644721231 has 4 divisors (see below), whose sum is σ = 1145657271672. Its totient is φ = 1145632170792.

The previous prime is 1145644721227. The next prime is 1145644721233. The reversal of 1145644721231 is 1321274465411.

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

It is a cyclic number.

It is not a de Polignac number, because 1145644721231 - 2² = 1145644721227 is a prime.

It is a super-2 number, since 2×1145644721231² (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 (1145644721233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6137285 + ... + 6321198.

It is an arithmetic number, because the mean of its divisors is an integer number (286414317918).

Almost surely, 2^{1145644721231} is an apocalyptic number.

1145644721231 is a deficient number, since it is larger than the sum of its proper divisors (12550441).

1145644721231 is an equidigital number, since it uses as much as digits as its factorization.

1145644721231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12550440.

The product of its digits is 161280, while the sum is 41.

The spelling of 1145644721231 in words is "one trillion, one hundred forty-five billion, six hundred forty-four million, seven hundred twenty-one thousand, two hundred thirty-one".