121903493 has 4 divisors (see below), whose sum is σ = 125198220. Its totient is φ = 118608768.

The previous prime is 121903471. The next prime is 121903513. The reversal of 121903493 is 394309121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 394309121 = 599 ⋅658279.

It can be written as a sum of positive squares in 2 ways, for example, as 107288164 + 14615329 = 10358^2 + 3823^2 .

It is a cyclic number.

It is not a de Polignac number, because 121903493 - 2⁶ = 121903429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121903423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1647308 + ... + 1647381.

It is an arithmetic number, because the mean of its divisors is an integer number (31299555).

Almost surely, 2^121903493 is an apocalyptic number.

It is an amenable number.

121903493 is a deficient number, since it is larger than the sum of its proper divisors (3294727).

121903493 is an equidigital number, since it uses as much as digits as its factorization.

121903493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3294726.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 121903493 is about 11040.9914862751. The cubic root of 121903493 is about 495.8367549953.

The spelling of 121903493 in words is "one hundred twenty-one million, nine hundred three thousand, four hundred ninety-three".