61580989 has 2 divisors, whose sum is σ = 61580990. Its totient is φ = 61580988.

The previous prime is 61580977. The next prime is 61580993. The reversal of 61580989 is 98908516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52925625 + 8655364 = 7275^2 + 2942^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61580989 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61580999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30790494 + 30790495.

It is an arithmetic number, because the mean of its divisors is an integer number (30790495).

Almost surely, 2^61580989 is an apocalyptic number.

It is an amenable number.

61580989 is a deficient number, since it is larger than the sum of its proper divisors (1).

61580989 is an equidigital number, since it uses as much as digits as its factorization.

61580989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 61580989 is about 7847.3555418370. The cubic root of 61580989 is about 394.8955318454.

The spelling of 61580989 in words is "sixty-one million, five hundred eighty thousand, nine hundred eighty-nine".