1231011000 has 256 divisors, whose sum is σ = 4313088000. Its totient is φ = 324777600.

The previous prime is 1231010999. The next prime is 1231011013. The reversal of 1231011000 is 1101321.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3428821 + ... + 3429179.

It is an arithmetic number, because the mean of its divisors is an integer number (16848000).

Almost surely, 2^1231011000 is an apocalyptic number.

1231011000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231011000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2156544000).

1231011000 is an abundant number, since it is smaller than the sum of its proper divisors (3082077000).

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

1231011000 is a wasteful number, since it uses less digits than its factorization.

1231011000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 1231011000 is about 35085.7663447729. The cubic root of 1231011000 is about 1071.7347467836.

Adding to 1231011000 its reverse (1101321), we get a palindrome (1232112321).

The spelling of 1231011000 in words is "one billion, two hundred thirty-one million, eleven thousand".