61499689 has 2 divisors, whose sum is σ = 61499690. Its totient is φ = 61499688.

The previous prime is 61499687. The next prime is 61499699. The reversal of 61499689 is 98699416.

61499689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57638464 + 3861225 = 7592^2 + 1965^2 .

It is a cyclic number.

It is not a de Polignac number, because 61499689 - 2¹ = 61499687 is a prime.

Together with 61499687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61499681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30749844 + 30749845.

It is an arithmetic number, because the mean of its divisors is an integer number (30749845).

Almost surely, 2^61499689 is an apocalyptic number.

It is an amenable number.

61499689 is a deficient number, since it is larger than the sum of its proper divisors (1).

61499689 is an equidigital number, since it uses as much as digits as its factorization.

61499689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 52.

The square root of 61499689 is about 7842.1737420182. The cubic root of 61499689 is about 394.7216732888.

The spelling of 61499689 in words is "sixty-one million, four hundred ninety-nine thousand, six hundred eighty-nine".