201231000 has 256 divisors, whose sum is σ = 724464000. Its totient is φ = 51609600.

The previous prime is 201230987. The next prime is 201231001. The reversal of 201231000 is 132102.

It is a happy number.

It is a super-2 number, since 2×201231000² = 80987830722000000, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201231001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 782872 + ... + 783128.

Almost surely, 2^201231000 is an apocalyptic number.

201231000 is a gapful number since it is divisible by the number (20) 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 201231000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362232000).

201231000 is an abundant number, since it is smaller than the sum of its proper divisors (523233000).

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

201231000 is a wasteful number, since it uses less digits than its factorization.

201231000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 201231000 is about 14185.5912812967. The cubic root of 201231000 is about 586.0009163362. Note that the first 3 decimals are identical.

Adding to 201231000 its reverse (132102), we get a palindrome (201363102).

The spelling of 201231000 in words is "two hundred one million, two hundred thirty-one thousand".