121973617 has 4 divisors (see below), whose sum is σ = 124275060. Its totient is φ = 119672176.

The previous prime is 121973609. The next prime is 121973633. The reversal of 121973617 is 716379121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716379121 = 59 ⋅12142019.

It can be written as a sum of positive squares in 2 ways, for example, as 112338801 + 9634816 = 10599^2 + 3104^2 .

It is a cyclic number.

It is not a de Polignac number, because 121973617 - 2³ = 121973609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121973017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1150642 + ... + 1150747.

It is an arithmetic number, because the mean of its divisors is an integer number (31068765).

Almost surely, 2^121973617 is an apocalyptic number.

It is an amenable number.

121973617 is a deficient number, since it is larger than the sum of its proper divisors (2301443).

121973617 is an equidigital number, since it uses as much as digits as its factorization.

121973617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301442.

The product of its digits is 15876, while the sum is 37.

The square root of 121973617 is about 11044.1666503182. The cubic root of 121973617 is about 495.9318121338.

The spelling of 121973617 in words is "one hundred twenty-one million, nine hundred seventy-three thousand, six hundred seventeen".