61061009 has 2 divisors, whose sum is σ = 61061010. Its totient is φ = 61061008.

The previous prime is 61060997. The next prime is 61061023. The reversal of 61061009 is 90016016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37246609 + 23814400 = 6103^2 + 4880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61061009 is a prime.

It is not a weakly prime, because it can be changed into another prime (61061029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30530504 + 30530505.

It is an arithmetic number, because the mean of its divisors is an integer number (30530505).

Almost surely, 2^61061009 is an apocalyptic number.

It is an amenable number.

61061009 is a deficient number, since it is larger than the sum of its proper divisors (1).

61061009 is an equidigital number, since it uses as much as digits as its factorization.

61061009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 61061009 is about 7814.1544008293. The cubic root of 61061009 is about 393.7809105153.

The spelling of 61061009 in words is "sixty-one million, sixty-one thousand, nine".