121552530 has 64 divisors (see below), whose sum is σ = 319483008. Its totient is φ = 29352960.

The previous prime is 121552507. The next prime is 121552553. The reversal of 121552530 is 35255121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121552507) and next prime (121552553).

It is a self number, because there is not a number n which added to its sum of digits gives 121552530.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110664 + ... + 111756.

It is an arithmetic number, because the mean of its divisors is an integer number (4991922).

Almost surely, 2^121552530 is an apocalyptic number.

121552530 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 121552530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159741504).

121552530 is an abundant number, since it is smaller than the sum of its proper divisors (197930478).

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

121552530 is a wasteful number, since it uses less digits than its factorization.

121552530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451.

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 121552530 is about 11025.0863942193. The cubic root of 121552530 is about 495.3604557488.

The spelling of 121552530 in words is "one hundred twenty-one million, five hundred fifty-two thousand, five hundred thirty".