1231532501131 has 16 divisors (see below), whose sum is σ = 1259639434368. Its totient is φ = 1203506022400.

The previous prime is 1231532501113. The next prime is 1231532501153. The reversal of 1231532501131 is 1311052351321.

It is a cyclic number.

It is not a de Polignac number, because 1231532501131 - 2⁵ = 1231532501099 is a prime.

It is a super-2 number, since 2×1231532501131² (a number of 25 digits) contains 22 as substring.

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 1231532501131.

It is not an unprimeable number, because it can be changed into a prime (1231532501231) 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, 175603581 + ... + 175610593.

It is an arithmetic number, because the mean of its divisors is an integer number (78727464648).

Almost surely, 2^{1231532501131} is an apocalyptic number.

1231532501131 is a deficient number, since it is larger than the sum of its proper divisors (28106933237).

1231532501131 is an equidigital number, since it uses as much as digits as its factorization.

1231532501131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12182.

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

Adding to 1231532501131 its reverse (1311052351321), we get a palindrome (2542584852452).

The spelling of 1231532501131 in words is "one trillion, two hundred thirty-one billion, five hundred thirty-two million, five hundred one thousand, one hundred thirty-one".