120728581 has 2 divisors, whose sum is σ = 120728582. Its totient is φ = 120728580.

The previous prime is 120728579. The next prime is 120728593. The reversal of 120728581 is 185827021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73256481 + 47472100 = 8559^2 + 6890^2 .

It is an emirp because it is prime and its reverse (185827021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120728581 - 2¹ = 120728579 is a prime.

It is a super-2 number, since 2×120728581² = 29150780540547122, which contains 22 as substring.

Together with 120728579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120728501) 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, 60364290 + 60364291.

It is an arithmetic number, because the mean of its divisors is an integer number (60364291).

Almost surely, 2^120728581 is an apocalyptic number.

It is an amenable number.

120728581 is a deficient number, since it is larger than the sum of its proper divisors (1).

120728581 is an equidigital number, since it uses as much as digits as its factorization.

120728581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 120728581 is about 10987.6558464488. The cubic root of 120728581 is about 494.2386431861.

The spelling of 120728581 in words is "one hundred twenty million, seven hundred twenty-eight thousand, five hundred eighty-one".