1231371513015 has 32 divisors (see below), whose sum is σ = 2253714817536. Its totient is φ = 562396679040.

The previous prime is 1231371513011. The next prime is 1231371513137. The reversal of 1231371513015 is 5103151731321.

It is not a de Polignac number, because 1231371513015 - 2² = 1231371513011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231371513011) 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, 5260032 + ... + 5489141.

It is an arithmetic number, because the mean of its divisors is an integer number (70428588048).

Almost surely, 2^{1231371513015} is an apocalyptic number.

1231371513015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1231371513015 is a deficient number, since it is larger than the sum of its proper divisors (1022343304521).

1231371513015 is a wasteful number, since it uses less digits than its factorization.

1231371513015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10750279.

The product of its (nonzero) digits is 9450, while the sum is 33.

The spelling of 1231371513015 in words is "one trillion, two hundred thirty-one billion, three hundred seventy-one million, five hundred thirteen thousand, fifteen".