121610455 has 4 divisors (see below), whose sum is σ = 145932552. Its totient is φ = 97288360.

The previous prime is 121610443. The next prime is 121610471. The reversal of 121610455 is 554016121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 554016121 = 149 ⋅3718229.

It is not a de Polignac number, because 121610455 - 2¹⁷ = 121479383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 12161041 + ... + 12161050.

It is an arithmetic number, because the mean of its divisors is an integer number (36483138).

Almost surely, 2^121610455 is an apocalyptic number.

121610455 is a deficient number, since it is larger than the sum of its proper divisors (24322097).

121610455 is an equidigital number, since it uses as much as digits as its factorization.

121610455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24322096.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 121610455 is about 11027.7130448702. The cubic root of 121610455 is about 495.4391300956.

Adding to 121610455 its reverse (554016121), we get a palindrome (675626576).

The spelling of 121610455 in words is "one hundred twenty-one million, six hundred ten thousand, four hundred fifty-five".