1031201555020 has 192 divisors, whose sum is σ = 2683347803136. Its totient is φ = 324149253120.

The previous prime is 1031201555009. The next prime is 1031201555023. The reversal of 1031201555020 is 205551021301.

It is not an unprimeable number, because it can be changed into a prime (1031201555023) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 244880715 + ... + 244884925.

It is an arithmetic number, because the mean of its divisors is an integer number (13975769808).

Almost surely, 2^{1031201555020} is an apocalyptic number.

1031201555020 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 1031201555020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1341673901568).

1031201555020 is an abundant number, since it is smaller than the sum of its proper divisors (1652146248116).

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

1031201555020 is a wasteful number, since it uses less digits than its factorization.

1031201555020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120 (or 5118 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

Adding to 1031201555020 its reverse (205551021301), we get a palindrome (1236752576321).

The spelling of 1031201555020 in words is "one trillion, thirty-one billion, two hundred one million, five hundred fifty-five thousand, twenty".