61907609 has 2 divisors, whose sum is σ = 61907610. Its totient is φ = 61907608.

The previous prime is 61907603. The next prime is 61907617. The reversal of 61907609 is 90670916.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33605209 + 28302400 = 5797^2 + 5320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61907609 is a prime.

It is not a weakly prime, because it can be changed into another prime (61907603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30953804 + 30953805.

It is an arithmetic number, because the mean of its divisors is an integer number (30953805).

Almost surely, 2^61907609 is an apocalyptic number.

It is an amenable number.

61907609 is a deficient number, since it is larger than the sum of its proper divisors (1).

61907609 is an equidigital number, since it uses as much as digits as its factorization.

61907609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 61907609 is about 7868.1388523589. The cubic root of 61907609 is about 395.5924645413.

The spelling of 61907609 in words is "sixty-one million, nine hundred seven thousand, six hundred nine".