1231534530105 has 32 divisors (see below), whose sum is σ = 2150370288000. Its totient is φ = 596890222080.

The previous prime is 1231534530103. The next prime is 1231534530181. The reversal of 1231534530105 is 5010354351321.

It is not a de Polignac number, because 1231534530105 - 2¹ = 1231534530103 is a prime.

It is a super-2 number, since 2×1231534530105² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1231534530103) 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, 903972 + ... + 1811141.

It is an arithmetic number, because the mean of its divisors is an integer number (67199071500).

Almost surely, 2^{1231534530105} is an apocalyptic number.

1231534530105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231534530105 is a deficient number, since it is larger than the sum of its proper divisors (918835757895).

1231534530105 is a wasteful number, since it uses less digits than its factorization.

1231534530105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717881.

The product of its (nonzero) digits is 27000, while the sum is 33.

Adding to 1231534530105 its reverse (5010354351321), we get a palindrome (6241888881426).

The spelling of 1231534530105 in words is "one trillion, two hundred thirty-one billion, five hundred thirty-four million, five hundred thirty thousand, one hundred five".