1231501301515 has 16 divisors (see below), whose sum is σ = 1493848699488. Its totient is φ = 974553774336.

The previous prime is 1231501301507. The next prime is 1231501301519. The reversal of 1231501301515 is 5151031051321.

It is a cyclic number.

It is not a de Polignac number, because 1231501301515 - 2³ = 1231501301507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231501301519) 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, 2982492 + ... + 3370201.

It is an arithmetic number, because the mean of its divisors is an integer number (93365543718).

Almost surely, 2^{1231501301515} is an apocalyptic number.

1231501301515 is a deficient number, since it is larger than the sum of its proper divisors (262347397973).

1231501301515 is a wasteful number, since it uses less digits than its factorization.

1231501301515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6353118.

The product of its (nonzero) digits is 2250, while the sum is 28.

Adding to 1231501301515 its reverse (5151031051321), we get a palindrome (6382532352836).

The spelling of 1231501301515 in words is "one trillion, two hundred thirty-one billion, five hundred one million, three hundred one thousand, five hundred fifteen".