1161550 has 24 divisors (see below), whose sum is σ = 2327976. Its totient is φ = 428640.

The previous prime is 1161547. The next prime is 1161551. The reversal of 1161550 is 551611.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 244 + ... + 1543.

It is an arithmetic number, because the mean of its divisors is an integer number (96999).

2^1161550 is an apocalyptic number.

1161550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1161550 is an abundant number, since it is smaller than the sum of its proper divisors (1166426).

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

1161550 is a wasteful number, since it uses less digits than its factorization.

1161550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812 (or 1807 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 1161550 is about 1077.7522906494. The cubic root of 1161550 is about 105.1185358232.

It can be divided in two parts, 1161 and 550, that added together give a triangular number (1711 = T₅₈).

The spelling of 1161550 in words is "one million, one hundred sixty-one thousand, five hundred fifty".