121613361 has 4 divisors (see below), whose sum is σ = 162151152. Its totient is φ = 81075572.

The previous prime is 121613309. The next prime is 121613363. The reversal of 121613361 is 163316121.

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: 163316121 = 3 ⋅54438707.

It is a cyclic number.

It is not a de Polignac number, because 121613361 - 2¹⁵ = 121580593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121613363) 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, 20268891 + ... + 20268896.

It is an arithmetic number, because the mean of its divisors is an integer number (40537788).

Almost surely, 2^121613361 is an apocalyptic number.

It is an amenable number.

121613361 is a deficient number, since it is larger than the sum of its proper divisors (40537791).

121613361 is an equidigital number, since it uses as much as digits as its factorization.

121613361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40537790.

The product of its digits is 648, while the sum is 24.

The square root of 121613361 is about 11027.8448030429. The cubic root of 121613361 is about 495.4430763973.

Adding to 121613361 its reverse (163316121), we get a palindrome (284929482).

The spelling of 121613361 in words is "one hundred twenty-one million, six hundred thirteen thousand, three hundred sixty-one".