788861581 has 2 divisors, whose sum is σ = 788861582. Its totient is φ = 788861580.

The previous prime is 788861569. The next prime is 788861597. The reversal of 788861581 is 185168887.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 733597225 + 55264356 = 27085^2 + 7434^2 .

It is a cyclic number.

It is not a de Polignac number, because 788861581 - 2¹⁵ = 788828813 is a prime.

It is a super-2 number, since 2×788861581² = 1244605187955639122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (788861501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 394430790 + 394430791.

It is an arithmetic number, because the mean of its divisors is an integer number (394430791).

Almost surely, 2^788861581 is an apocalyptic number.

It is an amenable number.

788861581 is a deficient number, since it is larger than the sum of its proper divisors (1).

788861581 is an equidigital number, since it uses as much as digits as its factorization.

788861581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 860160, while the sum is 52.

The square root of 788861581 is about 28086.6797788560. The cubic root of 788861581 is about 923.9892855120.

The spelling of 788861581 in words is "seven hundred eighty-eight million, eight hundred sixty-one thousand, five hundred eighty-one".