1531125556280 has 128 divisors (see below), whose sum is σ = 3648868715520. Its totient is φ = 577028981760.

The previous prime is 1531125556243. The next prime is 1531125556307. The reversal of 1531125556280 is 826555211351.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73343924 + ... + 73364796.

It is an arithmetic number, because the mean of its divisors is an integer number (28506786840).

Almost surely, 2^{1531125556280} is an apocalyptic number.

1531125556280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1531125556280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1824434357760).

1531125556280 is an abundant number, since it is smaller than the sum of its proper divisors (2117743159240).

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

1531125556280 is a wasteful number, since it uses less digits than its factorization.

1531125556280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22101 (or 22097 counting only the distinct ones).

The product of its (nonzero) digits is 360000, while the sum is 44.

The spelling of 1531125556280 in words is "one trillion, five hundred thirty-one billion, one hundred twenty-five million, five hundred fifty-six thousand, two hundred eighty".