1231455043505 has 8 divisors (see below), whose sum is σ = 1478598772392. Its totient is φ = 984595554688.

The previous prime is 1231455043451. The next prime is 1231455043519. The reversal of 1231455043505 is 5053405541321.

It can be written as a sum of positive squares in 4 ways, for example, as 76242806641 + 1155212236864 = 276121^2 + 1074808^2 .

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 1231455043505 - 2¹⁶ = 1231454977969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 71050484 + ... + 71067813.

It is an arithmetic number, because the mean of its divisors is an integer number (184824846549).

Almost surely, 2^{1231455043505} is an apocalyptic number.

It is an amenable number.

1231455043505 is a deficient number, since it is larger than the sum of its proper divisors (247143728887).

1231455043505 is a wasteful number, since it uses less digits than its factorization.

1231455043505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142120035.

The product of its (nonzero) digits is 180000, while the sum is 38.

The spelling of 1231455043505 in words is "one trillion, two hundred thirty-one billion, four hundred fifty-five million, forty-three thousand, five hundred five".