61193789 has 2 divisors, whose sum is σ = 61193790. Its totient is φ = 61193788.

The previous prime is 61193767. The next prime is 61193809. The reversal of 61193789 is 98739116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38962564 + 22231225 = 6242^2 + 4715^2 .

It is a cyclic number.

It is not a de Polignac number, because 61193789 - 2⁸ = 61193533 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61193729) 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, 30596894 + 30596895.

It is an arithmetic number, because the mean of its divisors is an integer number (30596895).

Almost surely, 2^61193789 is an apocalyptic number.

It is an amenable number.

61193789 is a deficient number, since it is larger than the sum of its proper divisors (1).

61193789 is an equidigital number, since it uses as much as digits as its factorization.

61193789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 61193789 is about 7822.6459078754. The cubic root of 61193789 is about 394.0661354964.

The spelling of 61193789 in words is "sixty-one million, one hundred ninety-three thousand, seven hundred eighty-nine".