120249581 has 2 divisors, whose sum is σ = 120249582. Its totient is φ = 120249580.

The previous prime is 120249559. The next prime is 120249583. The reversal of 120249581 is 185942021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119552356 + 697225 = 10934^2 + 835^2 .

It is an emirp because it is prime and its reverse (185942021) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120249581 is a prime.

It is a super-2 number, since 2×120249581² = 28919923461351122, which contains 22 as substring.

Together with 120249583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120249583) 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, 60124790 + 60124791.

It is an arithmetic number, because the mean of its divisors is an integer number (60124791).

Almost surely, 2^120249581 is an apocalyptic number.

It is an amenable number.

120249581 is a deficient number, since it is larger than the sum of its proper divisors (1).

120249581 is an equidigital number, since it uses as much as digits as its factorization.

120249581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 120249581 is about 10965.8369949585. The cubic root of 120249581 is about 493.5841334440.

The spelling of 120249581 in words is "one hundred twenty million, two hundred forty-nine thousand, five hundred eighty-one".