61306121 has 2 divisors, whose sum is σ = 61306122. Its totient is φ = 61306120.

The previous prime is 61306099. The next prime is 61306123. The reversal of 61306121 is 12160316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59521225 + 1784896 = 7715^2 + 1336^2 .

It is a cyclic number.

It is not a de Polignac number, because 61306121 - 2¹⁴ = 61289737 is a prime.

Together with 61306123, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61306093 and 61306102.

It is not a weakly prime, because it can be changed into another prime (61306123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30653060 + 30653061.

It is an arithmetic number, because the mean of its divisors is an integer number (30653061).

Almost surely, 2^61306121 is an apocalyptic number.

It is an amenable number.

61306121 is a deficient number, since it is larger than the sum of its proper divisors (1).

61306121 is an equidigital number, since it uses as much as digits as its factorization.

61306121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 61306121 is about 7829.8225394960. The cubic root of 61306121 is about 394.3071140842.

Adding to 61306121 its reverse (12160316), we get a palindrome (73466437).

The spelling of 61306121 in words is "sixty-one million, three hundred six thousand, one hundred twenty-one".