61215101089 has 2 divisors, whose sum is σ = 61215101090. Its totient is φ = 61215101088.

The previous prime is 61215101069. The next prime is 61215101093. The reversal of 61215101089 is 98010151216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42345408400 + 18869692689 = 205780^2 + 137367^2 .

It is a cyclic number.

It is not a de Polignac number, because 61215101089 - 2¹¹ = 61215099041 is a prime.

It is not a weakly prime, because it can be changed into another prime (61215101029) 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 as a sum of consecutive naturals, namely, 30607550544 + 30607550545.

It is an arithmetic number, because the mean of its divisors is an integer number (30607550545).

Almost surely, 2^61215101089 is an apocalyptic number.

It is an amenable number.

61215101089 is a deficient number, since it is larger than the sum of its proper divisors (1).

61215101089 is an equidigital number, since it uses as much as digits as its factorization.

61215101089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 34.

The spelling of 61215101089 in words is "sixty-one billion, two hundred fifteen million, one hundred one thousand, eighty-nine".