1231153705531 has 16 divisors (see below), whose sum is σ = 1299260944800. Its totient is φ = 1163380147200.

The previous prime is 1231153705513. The next prime is 1231153705583. The reversal of 1231153705531 is 1355073511321.

It is a cyclic number.

It is not a de Polignac number, because 1231153705531 - 2¹³ = 1231153697339 is a prime.

It is a super-2 number, since 2×1231153705531² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231153705631) 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 15 ways as a sum of consecutive naturals, for example, 16800651 + ... + 16873771.

It is an arithmetic number, because the mean of its divisors is an integer number (81203809050).

Almost surely, 2^{1231153705531} is an apocalyptic number.

1231153705531 is a deficient number, since it is larger than the sum of its proper divisors (68107239269).

1231153705531 is a wasteful number, since it uses less digits than its factorization.

1231153705531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75390.

The product of its (nonzero) digits is 47250, while the sum is 37.

The spelling of 1231153705531 in words is "one trillion, two hundred thirty-one billion, one hundred fifty-three million, seven hundred five thousand, five hundred thirty-one".