1231132215 has 32 divisors (see below), whose sum is σ = 2087467200. Its totient is φ = 618490880.

The previous prime is 1231132211. The next prime is 1231132223. The reversal of 1231132215 is 5122311321.

It is not a de Polignac number, because 1231132215 - 2² = 1231132211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231132191 and 1231132200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231132211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16680 + ... + 52349.

It is an arithmetic number, because the mean of its divisors is an integer number (65233350).

Almost surely, 2^1231132215 is an apocalyptic number.

1231132215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1231132215 is a deficient number, since it is larger than the sum of its proper divisors (856334985).

1231132215 is a wasteful number, since it uses less digits than its factorization.

1231132215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69107.

The product of its digits is 360, while the sum is 21.

The square root of 1231132215 is about 35087.4937121476. The cubic root of 1231132215 is about 1071.7699227659.

Adding to 1231132215 its reverse (5122311321), we get a palindrome (6353443536).

The spelling of 1231132215 in words is "one billion, two hundred thirty-one million, one hundred thirty-two thousand, two hundred fifteen".