1531551322112 has 104 divisors (see below), whose sum is σ = 3594865555776. Its totient is φ = 638638718976.

The previous prime is 1531551322031. The next prime is 1531551322117. The reversal of 1531551322112 is 2112231551351.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (1531551322117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339023 + ... + 1782705.

Almost surely, 2^{1531551322112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1531551322112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1797432777888).

1531551322112 is an abundant number, since it is smaller than the sum of its proper divisors (2063314233664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1531551322112 is an equidigital number, since it uses as much as digits as its factorization.

1531551322112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443751 (or 1443729 counting only the distinct ones).

The product of its digits is 9000, while the sum is 32.

Adding to 1531551322112 its reverse (2112231551351), we get a palindrome (3643782873463).

The spelling of 1531551322112 in words is "one trillion, five hundred thirty-one billion, five hundred fifty-one million, three hundred twenty-two thousand, one hundred twelve".