1001561550 has 48 divisors (see below), whose sum is σ = 2709683712. Its totient is φ = 242802400.

The previous prime is 1001561549. The next prime is 1001561557. The reversal of 1001561550 is 551651001.

1001561550 is digitally balanced in base 6, 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 1001561550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001561557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 301854 + ... + 305153.

It is an arithmetic number, because the mean of its divisors is an integer number (56451744).

Almost surely, 2^1001561550 is an apocalyptic number.

1001561550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1001561550 is an abundant number, since it is smaller than the sum of its proper divisors (1708122162).

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

1001561550 is a wasteful number, since it uses less digits than its factorization.

1001561550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607033 (or 607028 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 1001561550 is about 31647.4572438292. The cubic root of 1001561550 is about 1000.5202459639.

The spelling of 1001561550 in words is "one billion, one million, five hundred sixty-one thousand, five hundred fifty".