121553455 has 16 divisors (see below), whose sum is σ = 147873600. Its totient is φ = 95913472.

The previous prime is 121553447. The next prime is 121553483. The reversal of 121553455 is 554355121.

It is a cyclic number.

It is not a de Polignac number, because 121553455 - 2³ = 121553447 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123927 + ... + 124903.

It is an arithmetic number, because the mean of its divisors is an integer number (9242100).

Almost surely, 2^121553455 is an apocalyptic number.

121553455 is a deficient number, since it is larger than the sum of its proper divisors (26320145).

121553455 is a wasteful number, since it uses less digits than its factorization.

121553455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298.

The product of its digits is 15000, while the sum is 31.

The square root of 121553455 is about 11025.1283439242. The cubic root of 121553455 is about 495.3617122900.

The spelling of 121553455 in words is "one hundred twenty-one million, five hundred fifty-three thousand, four hundred fifty-five".