121615550 has 36 divisors (see below), whose sum is σ = 263141640. Its totient is φ = 41695920.

The previous prime is 121615541. The next prime is 121615583. The reversal of 121615550 is 55516121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 22370 + ... + 27269.

It is an arithmetic number, because the mean of its divisors is an integer number (7309490).

Almost surely, 2^121615550 is an apocalyptic number.

121615550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121615550 is an abundant number, since it is smaller than the sum of its proper divisors (141526090).

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

121615550 is a wasteful number, since it uses less digits than its factorization.

121615550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49665 (or 49653 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 26.

The square root of 121615550 is about 11027.9440513633. The cubic root of 121615550 is about 495.4460489829.

The spelling of 121615550 in words is "one hundred twenty-one million, six hundred fifteen thousand, five hundred fifty".