61394309 has 2 divisors, whose sum is σ = 61394310. Its totient is φ = 61394308.

The previous prime is 61394287. The next prime is 61394317. The reversal of 61394309 is 90349316.

61394309 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., 47541025 + 13853284 = 6895^2 + 3722^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61394309 is a prime.

It is a super-2 number, since 2×61394309² = 7538522355174962, which contains 22 as substring.

It is a Sophie Germain 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 (61394209) 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, 30697154 + 30697155.

It is an arithmetic number, because the mean of its divisors is an integer number (30697155).

Almost surely, 2^61394309 is an apocalyptic number.

It is an amenable number.

61394309 is a deficient number, since it is larger than the sum of its proper divisors (1).

61394309 is an equidigital number, since it uses as much as digits as its factorization.

61394309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 61394309 is about 7835.4520609854. The cubic root of 61394309 is about 394.4960919271.

The spelling of 61394309 in words is "sixty-one million, three hundred ninety-four thousand, three hundred nine".