1231201000 has 32 divisors (see below), whose sum is σ = 2881012680. Its totient is φ = 492480000.

The previous prime is 1231200961. The next prime is 1231201019. The reversal of 1231201000 is 1021321.

It can be written as a sum of positive squares in 4 ways, for example, as 137311524 + 1093889476 = 11718^2 + 33074^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 614601 + ... + 616600.

Almost surely, 2^1231201000 is an apocalyptic number.

1231201000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231201000 is an abundant number, since it is smaller than the sum of its proper divisors (1649811680).

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

1231201000 is a wasteful number, since it uses less digits than its factorization.

1231201000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231222 (or 1231208 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1231201000 is about 35088.4738910087. The cubic root of 1231201000 is about 1071.7898827995.

Adding to 1231201000 its reverse (1021321), we get a palindrome (1232222321).

The spelling of 1231201000 in words is "one billion, two hundred thirty-one million, two hundred one thousand".