61822609 has 2 divisors, whose sum is σ = 61822610. Its totient is φ = 61822608.

The previous prime is 61822601. The next prime is 61822661. The reversal of 61822609 is 90622816.

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., 44182609 + 17640000 = 6647^2 + 4200^2 .

It is a cyclic number.

It is not a de Polignac number, because 61822609 - 2³ = 61822601 is a prime.

It is not a weakly prime, because it can be changed into another prime (61822601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30911304 + 30911305.

It is an arithmetic number, because the mean of its divisors is an integer number (30911305).

Almost surely, 2^61822609 is an apocalyptic number.

It is an amenable number.

61822609 is a deficient number, since it is larger than the sum of its proper divisors (1).

61822609 is an equidigital number, since it uses as much as digits as its factorization.

61822609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 61822609 is about 7862.7354654726. The cubic root of 61822609 is about 395.4113303149.

The spelling of 61822609 in words is "sixty-one million, eight hundred twenty-two thousand, six hundred nine".