121455556 has 6 divisors (see below), whose sum is σ = 212547230. Its totient is φ = 60727776.

The previous prime is 121455547. The next prime is 121455557. The reversal of 121455556 is 655554121.

It can be written as a sum of positive squares in only one way, i.e., 118069956 + 3385600 = 10866^2 + 1840^2 .

It is not an unprimeable number, because it can be changed into a prime (121455557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15181941 + ... + 15181948.

Almost surely, 2^121455556 is an apocalyptic number.

It is an amenable number.

121455556 is a deficient number, since it is larger than the sum of its proper divisors (91091674).

121455556 is a wasteful number, since it uses less digits than its factorization.

121455556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30363893 (or 30363891 counting only the distinct ones).

The product of its digits is 30000, while the sum is 34.

The square root of 121455556 is about 11020.6876373482. The cubic root of 121455556 is about 495.2286886709.

The spelling of 121455556 in words is "one hundred twenty-one million, four hundred fifty-five thousand, five hundred fifty-six".