61648889 has 2 divisors, whose sum is σ = 61648890. Its totient is φ = 61648888.

The previous prime is 61648883. The next prime is 61648907. The reversal of 61648889 is 98884616.

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., 59799289 + 1849600 = 7733^2 + 1360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61648889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61648883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30824444 + 30824445.

It is an arithmetic number, because the mean of its divisors is an integer number (30824445).

Almost surely, 2^61648889 is an apocalyptic number.

It is an amenable number.

61648889 is a deficient number, since it is larger than the sum of its proper divisors (1).

61648889 is an equidigital number, since it uses as much as digits as its factorization.

61648889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 50.

The square root of 61648889 is about 7851.6806481160. The cubic root of 61648889 is about 395.0406175184.

The spelling of 61648889 in words is "sixty-one million, six hundred forty-eight thousand, eight hundred eighty-nine".