121719845 has 16 divisors (see below), whose sum is σ = 157593072. Its totient is φ = 89717760.

The previous prime is 121719823. The next prime is 121719877. The reversal of 121719845 is 548917121.

It can be written as a sum of positive squares in 8 ways, for example, as 3214849 + 118504996 = 1793^2 + 10886^2 .

It is not a de Polignac number, because 121719845 - 2⁸ = 121719589 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 121719799 and 121719808.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 41549 + ... + 44381.

It is an arithmetic number, because the mean of its divisors is an integer number (9849567).

Almost surely, 2^121719845 is an apocalyptic number.

It is an amenable number.

121719845 is a deficient number, since it is larger than the sum of its proper divisors (35873227).

121719845 is a wasteful number, since it uses less digits than its factorization.

121719845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3512.

The product of its digits is 20160, while the sum is 38.

The square root of 121719845 is about 11032.6717072521. The cubic root of 121719845 is about 495.5876366379.

The spelling of 121719845 in words is "one hundred twenty-one million, seven hundred nineteen thousand, eight hundred forty-five".