61517121 has 4 divisors (see below), whose sum is σ = 82022832. Its totient is φ = 41011412.

The previous prime is 61517119. The next prime is 61517177. The reversal of 61517121 is 12171516.

61517121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 61517121 - 2¹ = 61517119 is a prime.

It is a super-2 number, since 2×61517121² = 7568712352257282, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61517091 and 61517100.

It is not an unprimeable number, because it can be changed into a prime (61517921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10252851 + ... + 10252856.

It is an arithmetic number, because the mean of its divisors is an integer number (20505708).

Almost surely, 2^61517121 is an apocalyptic number.

It is an amenable number.

61517121 is a deficient number, since it is larger than the sum of its proper divisors (20505711).

61517121 is a wasteful number, since it uses less digits than its factorization.

61517121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20505710.

The product of its digits is 420, while the sum is 24.

The square root of 61517121 is about 7843.2850898077. The cubic root of 61517121 is about 394.7589641993.

Adding to 61517121 its reverse (12171516), we get a palindrome (73688637).

The spelling of 61517121 in words is "sixty-one million, five hundred seventeen thousand, one hundred twenty-one".