61079989 has 2 divisors, whose sum is σ = 61079990. Its totient is φ = 61079988.

The previous prime is 61079969. The next prime is 61079999. The reversal of 61079989 is 98997016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41499364 + 19580625 = 6442^2 + 4425^2 .

It is a cyclic number.

It is not a de Polignac number, because 61079989 - 2¹⁷ = 60948917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61079939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30539994 + 30539995.

It is an arithmetic number, because the mean of its divisors is an integer number (30539995).

Almost surely, 2^61079989 is an apocalyptic number.

It is an amenable number.

61079989 is a deficient number, since it is larger than the sum of its proper divisors (1).

61079989 is an equidigital number, since it uses as much as digits as its factorization.

61079989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 61079989 is about 7815.3687692904. The cubic root of 61079989 is about 393.8217068028.

The spelling of 61079989 in words is "sixty-one million, seventy-nine thousand, nine hundred eighty-nine".