1231206536 has 96 divisors (see below), whose sum is σ = 2881008000. Its totient is φ = 490299264.

The previous prime is 1231206503. The next prime is 1231206541. The reversal of 1231206536 is 6356021321.

It is a junction number, because it is equal to n+sod(n) for n = 1231206499 and 1231206508.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 393185 + ... + 396303.

It is an arithmetic number, because the mean of its divisors is an integer number (30010500).

Almost surely, 2^1231206536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231206536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1440504000).

1231206536 is an abundant number, since it is smaller than the sum of its proper divisors (1649801464).

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

1231206536 is a wasteful number, since it uses less digits than its factorization.

1231206536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211 (or 3200 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 1231206536 is about 35088.5527772235. The cubic root of 1231206536 is about 1071.7914892039.

Adding to 1231206536 its reverse (6356021321), we get a palindrome (7587227857).

The spelling of 1231206536 in words is "one billion, two hundred thirty-one million, two hundred six thousand, five hundred thirty-six".