121554403 has 4 divisors (see below), whose sum is σ = 128704680. Its totient is φ = 114404128.

The previous prime is 121554397. The next prime is 121554427. The reversal of 121554403 is 304455121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121554403 - 2¹⁷ = 121423331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121554473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3575113 + ... + 3575146.

It is an arithmetic number, because the mean of its divisors is an integer number (32176170).

Almost surely, 2^121554403 is an apocalyptic number.

121554403 is a deficient number, since it is larger than the sum of its proper divisors (7150277).

121554403 is an equidigital number, since it uses as much as digits as its factorization.

121554403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7150276.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 121554403 is about 11025.1713365371. The cubic root of 121554403 is about 495.3630000682.

The spelling of 121554403 in words is "one hundred twenty-one million, five hundred fifty-four thousand, four hundred three".