1231005000 has 80 divisors (see below), whose sum is σ = 3845706480. Its totient is φ = 328264000.

The previous prime is 1231004993. The next prime is 1231005007. The reversal of 1231005000 is 5001321.

It is an interprime number because it is at equal distance from previous prime (1231004993) and next prime (1231005007).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (1231005007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 26034 + ... + 56033.

It is an arithmetic number, because the mean of its divisors is an integer number (48071331).

Almost surely, 2^1231005000 is an apocalyptic number.

1231005000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231005000 is an abundant number, since it is smaller than the sum of its proper divisors (2614701480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231005000 is an equidigital number, since it uses as much as digits as its factorization.

1231005000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82096 (or 82077 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 1231005000 is about 35085.6808399096. The cubic root of 1231005000 is about 1071.7330055538.

Adding to 1231005000 its reverse (5001321), we get a palindrome (1236006321).

The spelling of 1231005000 in words is "one billion, two hundred thirty-one million, five thousand".