121555646 has 16 divisors (see below), whose sum is σ = 189615600. Its totient is φ = 58372608.

The previous prime is 121555631. The next prime is 121555649. The reversal of 121555646 is 646555121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121555649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5765 + ... + 16623.

It is an arithmetic number, because the mean of its divisors is an integer number (11850975).

Almost surely, 2^121555646 is an apocalyptic number.

121555646 is a deficient number, since it is larger than the sum of its proper divisors (68059954).

121555646 is a wasteful number, since it uses less digits than its factorization.

121555646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11083.

The product of its digits is 36000, while the sum is 35.

The square root of 121555646 is about 11025.2277073991. The cubic root of 121555646 is about 495.3646885690.

The spelling of 121555646 in words is "one hundred twenty-one million, five hundred fifty-five thousand, six hundred forty-six".