121905544 has 8 divisors (see below), whose sum is σ = 228572910. Its totient is φ = 60952768.

The previous prime is 121905533. The next prime is 121905551. The reversal of 121905544 is 445509121.

It can be written as a sum of positive squares in only one way, i.e., 89529444 + 32376100 = 9462^2 + 5690^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7619089 + ... + 7619104.

Almost surely, 2^121905544 is an apocalyptic number.

It is an amenable number.

121905544 is a deficient number, since it is larger than the sum of its proper divisors (106667366).

121905544 is a wasteful number, since it uses less digits than its factorization.

121905544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15238199 (or 15238195 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 121905544 is about 11041.0843670357. The cubic root of 121905544 is about 495.8395357618.

The spelling of 121905544 in words is "one hundred twenty-one million, nine hundred five thousand, five hundred forty-four".