121663590 has 32 divisors (see below), whose sum is σ = 294890976. Its totient is φ = 32121600.

The previous prime is 121663571. The next prime is 121663603. The reversal of 121663590 is 95366121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 17047 + ... + 23106.

It is an arithmetic number, because the mean of its divisors is an integer number (9215343).

Almost surely, 2^121663590 is an apocalyptic number.

121663590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121663590 is an abundant number, since it is smaller than the sum of its proper divisors (173227386).

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

121663590 is a wasteful number, since it uses less digits than its factorization.

121663590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40264.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 121663590 is about 11030.1219394892. The cubic root of 121663590 is about 495.5112766475.

The spelling of 121663590 in words is "one hundred twenty-one million, six hundred sixty-three thousand, five hundred ninety".