61249824989 has 2 divisors, whose sum is σ = 61249824990. Its totient is φ = 61249824988.

The previous prime is 61249824971. The next prime is 61249825051. The reversal of 61249824989 is 98942894216.

It is an a-pointer prime, because the next prime (61249825051) can be obtained adding 61249824989 to its sum of digits (62).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47233632889 + 14016192100 = 217333^2 + 118390^2 .

It is a cyclic number.

It is not a de Polignac number, because 61249824989 - 2¹⁶ = 61249759453 is a prime.

It is a super-2 number, since 2×61249824989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61249824089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30624912494 + 30624912495.

It is an arithmetic number, because the mean of its divisors is an integer number (30624912495).

Almost surely, 2^61249824989 is an apocalyptic number.

It is an amenable number.

61249824989 is a deficient number, since it is larger than the sum of its proper divisors (1).

61249824989 is an equidigital number, since it uses as much as digits as its factorization.

61249824989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17915904, while the sum is 62.

The spelling of 61249824989 in words is "sixty-one billion, two hundred forty-nine million, eight hundred twenty-four thousand, nine hundred eighty-nine".