61445989 has 16 divisors (see below), whose sum is σ = 68275584. Its totient is φ = 54835200.

The previous prime is 61445957. The next prime is 61446013. The reversal of 61445989 is 98954416.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 61445989 - 2⁵ = 61445957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61445929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218529 + ... + 218809.

It is an arithmetic number, because the mean of its divisors is an integer number (4267224).

Almost surely, 2^61445989 is an apocalyptic number.

It is an amenable number.

61445989 is a deficient number, since it is larger than the sum of its proper divisors (6829595).

61445989 is a wasteful number, since it uses less digits than its factorization.

61445989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588.

The product of its digits is 311040, while the sum is 46.

The square root of 61445989 is about 7838.7491986924. The cubic root of 61445989 is about 394.6067527820.

The spelling of 61445989 in words is "sixty-one million, four hundred forty-five thousand, nine hundred eighty-nine".