1231231615 has 16 divisors (see below), whose sum is σ = 1505095488. Its totient is φ = 966744576.

The previous prime is 1231231609. The next prime is 1231231621. The reversal of 1231231615 is 5161321321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1231231609) and next prime (1231231621).

It is a cyclic number.

It is not a de Polignac number, because 1231231615 - 2¹⁵ = 1231198847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231231615.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47617 + ... + 68773.

It is an arithmetic number, because the mean of its divisors is an integer number (94068468).

Almost surely, 2^1231231615 is an apocalyptic number.

1231231615 is a deficient number, since it is larger than the sum of its proper divisors (273863873).

1231231615 is a wasteful number, since it uses less digits than its factorization.

1231231615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21378.

The product of its digits is 1080, while the sum is 25.

The square root of 1231231615 is about 35088.9101426647. The cubic root of 1231231615 is about 1071.7987664222.

Adding to 1231231615 its reverse (5161321321), we get a palindrome (6392552936).

The spelling of 1231231615 in words is "one billion, two hundred thirty-one million, two hundred thirty-one thousand, six hundred fifteen".