61458721229 has 2 divisors, whose sum is σ = 61458721230. Its totient is φ = 61458721228.

The previous prime is 61458721217. The next prime is 61458721273. The reversal of 61458721229 is 92212785416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48986968900 + 12471752329 = 221330^2 + 111677^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61458721229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61458751229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30729360614 + 30729360615.

It is an arithmetic number, because the mean of its divisors is an integer number (30729360615).

Almost surely, 2^61458721229 is an apocalyptic number.

It is an amenable number.

61458721229 is a deficient number, since it is larger than the sum of its proper divisors (1).

61458721229 is an equidigital number, since it uses as much as digits as its factorization.

61458721229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 47.

The spelling of 61458721229 in words is "sixty-one billion, four hundred fifty-eight million, seven hundred twenty-one thousand, two hundred twenty-nine".