61996609 has 2 divisors, whose sum is σ = 61996610. Its totient is φ = 61996608.

The previous prime is 61996541. The next prime is 61996657. The reversal of 61996609 is 90669916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61858225 + 138384 = 7865^2 + 372^2 .

It is a cyclic number.

It is not a de Polignac number, because 61996609 - 2¹⁵ = 61963841 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61996309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30998304 + 30998305.

It is an arithmetic number, because the mean of its divisors is an integer number (30998305).

Almost surely, 2^61996609 is an apocalyptic number.

It is an amenable number.

61996609 is a deficient number, since it is larger than the sum of its proper divisors (1).

61996609 is an equidigital number, since it uses as much as digits as its factorization.

61996609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 61996609 is about 7873.7925423521. The cubic root of 61996609 is about 395.7819451319.

The spelling of 61996609 in words is "sixty-one million, nine hundred ninety-six thousand, six hundred nine".