1231202011 has 6 divisors (see below), whose sum is σ = 1333195260. Its totient is φ = 1136494008.

The previous prime is 1231202003. The next prime is 1231202017. The reversal of 1231202011 is 1102021321.

It is not a de Polignac number, because 1231202011 - 2³ = 1231202003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231201982 and 1231202000.

It is not an unprimeable number, because it can be changed into a prime (1231202017) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3642441 + ... + 3642778.

It is an arithmetic number, because the mean of its divisors is an integer number (222199210).

Almost surely, 2^1231202011 is an apocalyptic number.

1231202011 is a deficient number, since it is larger than the sum of its proper divisors (101993249).

1231202011 is an equidigital number, since it uses as much as digits as its factorization.

1231202011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7285245 (or 7285232 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1231202011 is about 35088.4882974459. The cubic root of 1231202011 is about 1071.7901761660.

Adding to 1231202011 its reverse (1102021321), we get a palindrome (2333223332).

The spelling of 1231202011 in words is "one billion, two hundred thirty-one million, two hundred two thousand, eleven".