121554006 has 36 divisors (see below), whose sum is σ = 283239612. Its totient is φ = 34675704.

The previous prime is 121553981. The next prime is 121554047. The reversal of 121554006 is 600455121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 188721 + ... + 189363.

It is an arithmetic number, because the mean of its divisors is an integer number (7867767).

Almost surely, 2^121554006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121554006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141619806).

121554006 is an abundant number, since it is smaller than the sum of its proper divisors (161685606).

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

121554006 is an frugal number, since it uses more digits than its factorization.

121554006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 121554006 is about 11025.1533322671. The cubic root of 121554006 is about 495.3624607779.

Multiplying 121554006 by its sum of digits (24), we get a square (2917296144 = 54012²).

It can be divided in two parts, 12155 and 4006, that added together give a palindrome (16161).

The spelling of 121554006 in words is "one hundred twenty-one million, five hundred fifty-four thousand, six".