58721809 has 2 divisors, whose sum is σ = 58721810. Its totient is φ = 58721808.

The previous prime is 58721797. The next prime is 58721863. The reversal of 58721809 is 90812785.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53246209 + 5475600 = 7297^2 + 2340^2 .

It is a cyclic number.

It is not a de Polignac number, because 58721809 - 2²³ = 50333201 is a prime.

It is not a weakly prime, because it can be changed into another prime (58721869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29360904 + 29360905.

It is an arithmetic number, because the mean of its divisors is an integer number (29360905).

Almost surely, 2^58721809 is an apocalyptic number.

It is an amenable number.

58721809 is a deficient number, since it is larger than the sum of its proper divisors (1).

58721809 is an equidigital number, since it uses as much as digits as its factorization.

58721809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 58721809 is about 7663.0156596473. The cubic root of 58721809 is about 388.6868149291.

The spelling of 58721809 in words is "fifty-eight million, seven hundred twenty-one thousand, eight hundred nine".