1231011215 has 16 divisors (see below), whose sum is σ = 1690264128. Its totient is φ = 843111936.

The previous prime is 1231011211. The next prime is 1231011217. The reversal of 1231011215 is 5121101321.

It is a cyclic number.

It is not a de Polignac number, because 1231011215 - 2² = 1231011211 is a prime.

It is a super-2 number, since 2×1231011215² = 3030777222911552450, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231011193 and 1231011202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231011211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9239 + ... + 50471.

It is an arithmetic number, because the mean of its divisors is an integer number (105641508).

Almost surely, 2^1231011215 is an apocalyptic number.

1231011215 is a deficient number, since it is larger than the sum of its proper divisors (459252913).

1231011215 is an equidigital number, since it uses as much as digits as its factorization.

1231011215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42098.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1231011215 is about 35085.7694086933. The cubic root of 1231011215 is about 1071.7348091775.

Adding to 1231011215 its reverse (5121101321), we get a palindrome (6352112536).

The spelling of 1231011215 in words is "one billion, two hundred thirty-one million, eleven thousand, two hundred fifteen".