61190989 has 2 divisors, whose sum is σ = 61190990. Its totient is φ = 61190988.

The previous prime is 61190981. The next prime is 61191043. The reversal of 61190989 is 98909116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51236964 + 9954025 = 7158^2 + 3155^2 .

It is a cyclic number.

It is not a de Polignac number, because 61190989 - 2³ = 61190981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61190981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30595494 + 30595495.

It is an arithmetic number, because the mean of its divisors is an integer number (30595495).

Almost surely, 2^61190989 is an apocalyptic number.

It is an amenable number.

61190989 is a deficient number, since it is larger than the sum of its proper divisors (1).

61190989 is an equidigital number, since it uses as much as digits as its factorization.

61190989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 61190989 is about 7822.4669382491. The cubic root of 61190989 is about 394.0601250716.

The spelling of 61190989 in words is "sixty-one million, one hundred ninety thousand, nine hundred eighty-nine".