1231505243031 has 16 divisors (see below), whose sum is σ = 1893186319104. Its totient is φ = 697489693824.

The previous prime is 1231505243029. The next prime is 1231505243047. The reversal of 1231505243031 is 1303425051321.

It is not a de Polignac number, because 1231505243031 - 2¹ = 1231505243029 is a prime.

It is a super-2 number, since 2×1231505243031² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1231505243031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231505243231) 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, 259480401 + ... + 259485146.

It is an arithmetic number, because the mean of its divisors is an integer number (118324144944).

Almost surely, 2^{1231505243031} is an apocalyptic number.

1231505243031 is a deficient number, since it is larger than the sum of its proper divisors (661681076073).

1231505243031 is a wasteful number, since it uses less digits than its factorization.

1231505243031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518965670.

The product of its (nonzero) digits is 10800, while the sum is 30.

The spelling of 1231505243031 in words is "one trillion, two hundred thirty-one billion, five hundred five million, two hundred forty-three thousand, thirty-one".