1231713000 has 640 divisors, whose sum is σ = 5243472000. Its totient is φ = 266716800.

The previous prime is 1231712983. The next prime is 1231713001. The reversal of 1231713000 is 3171321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1231713001) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 64826991 + ... + 64827009.

It is an arithmetic number, because the mean of its divisors is an integer number (8192925).

Almost surely, 2^1231713000 is an apocalyptic number.

1231713000 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 1231713000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2621736000).

1231713000 is an abundant number, since it is smaller than the sum of its proper divisors (4011759000).

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

1231713000 is an equidigital number, since it uses as much as digits as its factorization.

1231713000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 1231713000 is about 35095.7689757612. The cubic root of 1231713000 is about 1071.9384316203.

Adding to 1231713000 its reverse (3171321), we get a palindrome (1234884321).

The spelling of 1231713000 in words is "one billion, two hundred thirty-one million, seven hundred thirteen thousand".