1005145231231 has 4 divisors (see below), whose sum is σ = 1006857574632. Its totient is φ = 1003432887832.

The previous prime is 1005145231219. The next prime is 1005145231249. The reversal of 1005145231231 is 1321325415001.

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 1005145231231 - 2¹¹ = 1005145229183 is a prime.

It is a super-2 number, since 2×1005145231231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1005145231231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005145231031) 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, 856170820 + ... + 856171993.

It is an arithmetic number, because the mean of its divisors is an integer number (251714393658).

Almost surely, 2^{1005145231231} is an apocalyptic number.

1005145231231 is a deficient number, since it is larger than the sum of its proper divisors (1712343401).

1005145231231 is an equidigital number, since it uses as much as digits as its factorization.

1005145231231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1712343400.

The product of its (nonzero) digits is 3600, while the sum is 28.

It can be divided in two parts, 100514 and 5231231, that added together give a triangular number (5331745 = T₃₂₆₅).

The spelling of 1005145231231 in words is "one trillion, five billion, one hundred forty-five million, two hundred thirty-one thousand, two hundred thirty-one".