121853903 has 4 divisors (see below), whose sum is σ = 121975680. Its totient is φ = 121732128.

The previous prime is 121853899. The next prime is 121853917. The reversal of 121853903 is 309358121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 309358121 = 149 ⋅2076229.

It is a cyclic number.

It is not a de Polignac number, because 121853903 - 2² = 121853899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121853903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121853923) 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, 59375 + ... + 61392.

It is an arithmetic number, because the mean of its divisors is an integer number (30493920).

Almost surely, 2^121853903 is an apocalyptic number.

121853903 is a deficient number, since it is larger than the sum of its proper divisors (121777).

121853903 is a wasteful number, since it uses less digits than its factorization.

121853903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121776.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 121853903 is about 11038.7455356123. The cubic root of 121853903 is about 495.7695108745.

The spelling of 121853903 in words is "one hundred twenty-one million, eight hundred fifty-three thousand, nine hundred three".