61493009 has 2 divisors, whose sum is σ = 61493010. Its totient is φ = 61493008.

The previous prime is 61492999. The next prime is 61493011. The reversal of 61493009 is 90039416.

61493009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59985025 + 1507984 = 7745^2 + 1228^2 .

It is a cyclic number.

It is not a de Polignac number, because 61493009 - 2⁴ = 61492993 is a prime.

Together with 61493011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61493039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30746504 + 30746505.

It is an arithmetic number, because the mean of its divisors is an integer number (30746505).

Almost surely, 2^61493009 is an apocalyptic number.

It is an amenable number.

61493009 is a deficient number, since it is larger than the sum of its proper divisors (1).

61493009 is an equidigital number, since it uses as much as digits as its factorization.

61493009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 61493009 is about 7841.7478281312. The cubic root of 61493009 is about 394.7073814211.

The spelling of 61493009 in words is "sixty-one million, four hundred ninety-three thousand, nine".