61808449 has 2 divisors, whose sum is σ = 61808450. Its totient is φ = 61808448.

The previous prime is 61808407. The next prime is 61808471. The reversal of 61808449 is 94480816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58798224 + 3010225 = 7668^2 + 1735^2 .

It is a cyclic number.

It is not a de Polignac number, because 61808449 - 2⁷ = 61808321 is a prime.

It is not a weakly prime, because it can be changed into another prime (61808749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30904224 + 30904225.

It is an arithmetic number, because the mean of its divisors is an integer number (30904225).

Almost surely, 2^61808449 is an apocalyptic number.

It is an amenable number.

61808449 is a deficient number, since it is larger than the sum of its proper divisors (1).

61808449 is an equidigital number, since it uses as much as digits as its factorization.

61808449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 61808449 is about 7861.8349639254. The cubic root of 61808449 is about 395.3811393537.

The spelling of 61808449 in words is "sixty-one million, eight hundred eight thousand, four hundred forty-nine".