121911656 has 8 divisors (see below), whose sum is σ = 228584370. Its totient is φ = 60955824.

The previous prime is 121911653. The next prime is 121911667. The reversal of 121911656 is 656119121.

It can be written as a sum of positive squares in only one way, i.e., 80102500 + 41809156 = 8950^2 + 6466^2 .

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

It is not an unprimeable number, because it can be changed into a prime (121911653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7619471 + ... + 7619486.

Almost surely, 2^121911656 is an apocalyptic number.

It is an amenable number.

121911656 is a deficient number, since it is larger than the sum of its proper divisors (106672714).

121911656 is a wasteful number, since it uses less digits than its factorization.

121911656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15238963 (or 15238959 counting only the distinct ones).

The product of its digits is 3240, while the sum is 32.

The square root of 121911656 is about 11041.3611479745. The cubic root of 121911656 is about 495.8478222884.

The spelling of 121911656 in words is "one hundred twenty-one million, nine hundred eleven thousand, six hundred fifty-six".