1081211550 has 48 divisors (see below), whose sum is σ = 2690088240. Its totient is φ = 287389440.

The previous prime is 1081211471. The next prime is 1081211561. The reversal of 1081211550 is 551121801.

1081211550 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 1081211550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35436 + ... + 58464.

It is an arithmetic number, because the mean of its divisors is an integer number (56043505).

Almost surely, 2^1081211550 is an apocalyptic number.

1081211550 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 1081211550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1345044120).

1081211550 is an abundant number, since it is smaller than the sum of its proper divisors (1608876690).

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

1081211550 is a wasteful number, since it uses less digits than its factorization.

1081211550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23357 (or 23352 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 24.

The square root of 1081211550 is about 32881.7814298435. The cubic root of 1081211550 is about 1026.3690767377.

The spelling of 1081211550 in words is "one billion, eighty-one million, two hundred eleven thousand, five hundred fifty".