61318121 has 2 divisors, whose sum is σ = 61318122. Its totient is φ = 61318120.

The previous prime is 61318057. The next prime is 61318123. The reversal of 61318121 is 12181316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33640000 + 27678121 = 5800^2 + 5261^2 .

It is a cyclic number.

It is not a de Polignac number, because 61318121 - 2⁶ = 61318057 is a prime.

Together with 61318123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61318123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30659060 + 30659061.

It is an arithmetic number, because the mean of its divisors is an integer number (30659061).

Almost surely, 2^61318121 is an apocalyptic number.

It is an amenable number.

61318121 is a deficient number, since it is larger than the sum of its proper divisors (1).

61318121 is an equidigital number, since it uses as much as digits as its factorization.

61318121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 23.

The square root of 61318121 is about 7830.5888028934. The cubic root of 61318121 is about 394.3328395017.

Adding to 61318121 its reverse (12181316), we get a palindrome (73499437).

The spelling of 61318121 in words is "sixty-one million, three hundred eighteen thousand, one hundred twenty-one".