61530121 has 2 divisors, whose sum is σ = 61530122. Its totient is φ = 61530120.

The previous prime is 61530067. The next prime is 61530127. The reversal of 61530121 is 12103516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61011721 + 518400 = 7811^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 61530121 - 2⁹ = 61529609 is a prime.

It is not a weakly prime, because it can be changed into another prime (61530127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30765060 + 30765061.

It is an arithmetic number, because the mean of its divisors is an integer number (30765061).

Almost surely, 2^61530121 is an apocalyptic number.

It is an amenable number.

61530121 is a deficient number, since it is larger than the sum of its proper divisors (1).

61530121 is an equidigital number, since it uses as much as digits as its factorization.

61530121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 61530121 is about 7844.1137804088. The cubic root of 61530121 is about 394.7867694942.

Adding to 61530121 its reverse (12103516), we get a palindrome (73633637).

The spelling of 61530121 in words is "sixty-one million, five hundred thirty thousand, one hundred twenty-one".