61009439 has 2 divisors, whose sum is σ = 61009440. Its totient is φ = 61009438.

The previous prime is 61009397. The next prime is 61009471. The reversal of 61009439 is 93490016.

It is an a-pointer prime, because the next prime (61009471) can be obtained adding 61009439 to its sum of digits (32).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61009439 - 2⁸ = 61009183 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61008439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30504719 + 30504720.

It is an arithmetic number, because the mean of its divisors is an integer number (30504720).

Almost surely, 2^61009439 is an apocalyptic number.

61009439 is a deficient number, since it is larger than the sum of its proper divisors (1).

61009439 is an equidigital number, since it uses as much as digits as its factorization.

61009439 is an evil number, because the sum of its binary digits is even.

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

The square root of 61009439 is about 7810.8539225875. The cubic root of 61009439 is about 393.6700214144.

The spelling of 61009439 in words is "sixty-one million, nine thousand, four hundred thirty-nine".