121553000 has 32 divisors (see below), whose sum is σ = 284436360. Its totient is φ = 48620800.

The previous prime is 121552997. The next prime is 121553023. The reversal of 121553000 is 355121.

It can be written as a sum of positive squares in 4 ways, for example, as 8726116 + 112826884 = 2954^2 + 10622^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 121553000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59777 + ... + 61776.

Almost surely, 2^121553000 is an apocalyptic number.

121553000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121553000 is an abundant number, since it is smaller than the sum of its proper divisors (162883360).

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

121553000 is a wasteful number, since it uses less digits than its factorization.

121553000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121574 (or 121560 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 121553000 is about 11025.1077092244. The cubic root of 121553000 is about 495.3610942084.

The spelling of 121553000 in words is "one hundred twenty-one million, five hundred fifty-three thousand".