1231316515 has 32 divisors (see below), whose sum is σ = 1757952000. Its totient is φ = 816117120.

The previous prime is 1231316501. The next prime is 1231316519. The reversal of 1231316515 is 5156131321.

It is not a de Polignac number, because 1231316515 - 2⁹ = 1231316003 is a prime.

It is a super-2 number, since 2×1231316515² = 3032280720223490450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231316519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45586 + ... + 67384.

It is an arithmetic number, because the mean of its divisors is an integer number (54936000).

Almost surely, 2^1231316515 is an apocalyptic number.

1231316515 is a deficient number, since it is larger than the sum of its proper divisors (526635485).

1231316515 is a wasteful number, since it uses less digits than its factorization.

1231316515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21907.

The product of its digits is 2700, while the sum is 28.

The square root of 1231316515 is about 35090.1199057512. The cubic root of 1231316515 is about 1071.8234012736.

Adding to 1231316515 its reverse (5156131321), we get a palindrome (6387447836).

The spelling of 1231316515 in words is "one billion, two hundred thirty-one million, three hundred sixteen thousand, five hundred fifteen".