121542617 has 4 divisors (see below), whose sum is σ = 138905856. Its totient is φ = 104179380.

The previous prime is 121542613. The next prime is 121542643. The reversal of 121542617 is 716245121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 716245121 = 73 ⋅9811577.

It is a cyclic number.

It is not a de Polignac number, because 121542617 - 2² = 121542613 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 121542617.

It is not an unprimeable number, because it can be changed into a prime (121542613) 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, 8681609 + ... + 8681622.

It is an arithmetic number, because the mean of its divisors is an integer number (34726464).

Almost surely, 2^121542617 is an apocalyptic number.

It is an amenable number.

121542617 is a deficient number, since it is larger than the sum of its proper divisors (17363239).

121542617 is an equidigital number, since it uses as much as digits as its factorization.

121542617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17363238.

The product of its digits is 3360, while the sum is 29.

The square root of 121542617 is about 11024.6368194150. The cubic root of 121542617 is about 495.3469893030.

Adding to 121542617 its reverse (716245121), we get a palindrome (837787738).

The spelling of 121542617 in words is "one hundred twenty-one million, five hundred forty-two thousand, six hundred seventeen".