61298309 has 2 divisors, whose sum is σ = 61298310. Its totient is φ = 61298308.

The previous prime is 61298297. The next prime is 61298329. The reversal of 61298309 is 90389216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60497284 + 801025 = 7778^2 + 895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61298309 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61298329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30649154 + 30649155.

It is an arithmetic number, because the mean of its divisors is an integer number (30649155).

Almost surely, 2^61298309 is an apocalyptic number.

It is an amenable number.

61298309 is a deficient number, since it is larger than the sum of its proper divisors (1).

61298309 is an equidigital number, since it uses as much as digits as its factorization.

61298309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 61298309 is about 7829.3236617220. The cubic root of 61298309 is about 394.2903650333.

The spelling of 61298309 in words is "sixty-one million, two hundred ninety-eight thousand, three hundred nine".