1231551031043 has 16 divisors (see below), whose sum is σ = 1242354941952. Its totient is φ = 1220785020000.

The previous prime is 1231551031021. The next prime is 1231551031121. The reversal of 1231551031043 is 3401301551321.

It is a cyclic number.

It is not a de Polignac number, because 1231551031043 - 2¹² = 1231551026947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231551030997 and 1231551031015.

It is not an unprimeable number, because it can be changed into a prime (1231551030043) 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, 150350078 + ... + 150358268.

It is an arithmetic number, because the mean of its divisors is an integer number (77647183872).

Almost surely, 2^{1231551031043} is an apocalyptic number.

1231551031043 is a deficient number, since it is larger than the sum of its proper divisors (10803910909).

1231551031043 is a wasteful number, since it uses less digits than its factorization.

1231551031043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10346.

The product of its (nonzero) digits is 5400, while the sum is 29.

Adding to 1231551031043 its reverse (3401301551321), we get a palindrome (4632852582364).

The spelling of 1231551031043 in words is "one trillion, two hundred thirty-one billion, five hundred fifty-one million, thirty-one thousand, forty-three".