1200515550 has 96 divisors (see below), whose sum is σ = 3214481760. Its totient is φ = 294758400.

The previous prime is 1200515483. The next prime is 1200515557. The reversal of 1200515550 is 555150021.

It is a self number, because there is not a number n which added to its sum of digits gives 1200515550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200515557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1483546 + ... + 1484354.

It is an arithmetic number, because the mean of its divisors is an integer number (33484185).

Almost surely, 2^1200515550 is an apocalyptic number.

1200515550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1200515550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1607240880).

1200515550 is an abundant number, since it is smaller than the sum of its proper divisors (2013966210).

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

1200515550 is a wasteful number, since it uses less digits than its factorization.

1200515550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1598 (or 1593 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 1200515550 is about 34648.4566755866. The cubic root of 1200515550 is about 1062.8107289567.

Adding to 1200515550 its reverse (555150021), we get a palindrome (1755665571).

The spelling of 1200515550 in words is "one billion, two hundred million, five hundred fifteen thousand, five hundred fifty".