61087921729 has 2 divisors, whose sum is σ = 61087921730. Its totient is φ = 61087921728.

The previous prime is 61087921717. The next prime is 61087921819. The reversal of 61087921729 is 92712978016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60272705025 + 815216704 = 245505^2 + 28552^2 .

It is a cyclic number.

It is not a de Polignac number, because 61087921729 - 2⁹ = 61087921217 is a prime.

It is not a weakly prime, because it can be changed into another prime (61087921709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30543960864 + 30543960865.

It is an arithmetic number, because the mean of its divisors is an integer number (30543960865).

Almost surely, 2^61087921729 is an apocalyptic number.

It is an amenable number.

61087921729 is a deficient number, since it is larger than the sum of its proper divisors (1).

61087921729 is an equidigital number, since it uses as much as digits as its factorization.

61087921729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 52.

The spelling of 61087921729 in words is "sixty-one billion, eighty-seven million, nine hundred twenty-one thousand, seven hundred twenty-nine".