61442609 has 2 divisors, whose sum is σ = 61442610. Its totient is φ = 61442608.

The previous prime is 61442603. The next prime is 61442621. The reversal of 61442609 is 90624416.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58369600 + 3073009 = 7640^2 + 1753^2 .

It is a cyclic number.

It is not a de Polignac number, because 61442609 - 2¹⁶ = 61377073 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61442603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30721304 + 30721305.

It is an arithmetic number, because the mean of its divisors is an integer number (30721305).

Almost surely, 2^61442609 is an apocalyptic number.

It is an amenable number.

61442609 is a deficient number, since it is larger than the sum of its proper divisors (1).

61442609 is an equidigital number, since it uses as much as digits as its factorization.

61442609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 61442609 is about 7838.5336001066. The cubic root of 61442609 is about 394.5995171847.

The spelling of 61442609 in words is "sixty-one million, four hundred forty-two thousand, six hundred nine".