61162009 has 2 divisors, whose sum is σ = 61162010. Its totient is φ = 61162008.

The previous prime is 61161983. The next prime is 61162021. The reversal of 61162009 is 90026116.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58186384 + 2975625 = 7628^2 + 1725^2 .

It is a cyclic number.

It is not a de Polignac number, because 61162009 - 2⁹ = 61161497 is a prime.

It is not a weakly prime, because it can be changed into another prime (61162069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30581004 + 30581005.

It is an arithmetic number, because the mean of its divisors is an integer number (30581005).

Almost surely, 2^61162009 is an apocalyptic number.

It is an amenable number.

61162009 is a deficient number, since it is larger than the sum of its proper divisors (1).

61162009 is an equidigital number, since it uses as much as digits as its factorization.

61162009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 61162009 is about 7820.6143620562. The cubic root of 61162009 is about 393.9979064023.

The spelling of 61162009 in words is "sixty-one million, one hundred sixty-two thousand, nine".