1231003505 has 8 divisors (see below), whose sum is σ = 1517128872. Its totient is φ = 958186368.

The previous prime is 1231003457. The next prime is 1231003519. The reversal of 1231003505 is 5053001321.

It can be written as a sum of positive squares in 4 ways, for example, as 571592464 + 659411041 = 23908^2 + 25679^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231003505 - 2¹⁶ = 1230937969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3326852 + ... + 3327221.

It is an arithmetic number, because the mean of its divisors is an integer number (189641109).

Almost surely, 2^1231003505 is an apocalyptic number.

It is an amenable number.

1231003505 is a deficient number, since it is larger than the sum of its proper divisors (286125367).

1231003505 is an equidigital number, since it uses as much as digits as its factorization.

1231003505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6654115.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 1231003505 is about 35085.6595349154. The cubic root of 1231003505 is about 1071.7325716965.

Adding to 1231003505 its reverse (5053001321), we get a palindrome (6284004826).

The spelling of 1231003505 in words is "one billion, two hundred thirty-one million, three thousand, five hundred five".