61087420189 has 2 divisors, whose sum is σ = 61087420190. Its totient is φ = 61087420188.

The previous prime is 61087420153. The next prime is 61087420213. The reversal of 61087420189 is 98102478016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60585884164 + 501536025 = 246142^2 + 22395^2 .

It is a cyclic number.

It is not a de Polignac number, because 61087420189 - 2¹⁹ = 61086895901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61087420489) 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, 30543710094 + 30543710095.

It is an arithmetic number, because the mean of its divisors is an integer number (30543710095).

Almost surely, 2^61087420189 is an apocalyptic number.

It is an amenable number.

61087420189 is a deficient number, since it is larger than the sum of its proper divisors (1).

61087420189 is an equidigital number, since it uses as much as digits as its factorization.

61087420189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 46.

The spelling of 61087420189 in words is "sixty-one billion, eighty-seven million, four hundred twenty thousand, one hundred eighty-nine".