1231533053531 has 8 divisors (see below), whose sum is σ = 1343888951664. Its totient is φ = 1119243546720.

The previous prime is 1231533053503. The next prime is 1231533053557. The reversal of 1231533053531 is 1353503351321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231533053531 - 2¹⁸ = 1231532791387 is a prime.

It is a super-2 number, since 2×1231533053531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231533053491 and 1231533053500.

It is not an unprimeable number, because it can be changed into a prime (1231533053431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16559036 + ... + 16633241.

It is an arithmetic number, because the mean of its divisors is an integer number (167986118958).

Almost surely, 2^{1231533053531} is an apocalyptic number.

1231533053531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1231533053531 is a deficient number, since it is larger than the sum of its proper divisors (112355898133).

1231533053531 is a wasteful number, since it uses less digits than its factorization.

1231533053531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33195661.

The product of its (nonzero) digits is 60750, while the sum is 35.

The spelling of 1231533053531 in words is "one trillion, two hundred thirty-one billion, five hundred thirty-three million, fifty-three thousand, five hundred thirty-one".