123947581 has 2 divisors, whose sum is σ = 123947582. Its totient is φ = 123947580.

The previous prime is 123947573. The next prime is 123947591. The reversal of 123947581 is 185749321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69039481 + 54908100 = 8309^2 + 7410^2 .

It is a cyclic number.

It is not a de Polignac number, because 123947581 - 2³ = 123947573 is a prime.

It is a super-2 number, since 2×123947581² = 30726005671503122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123947501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61973790 + 61973791.

It is an arithmetic number, because the mean of its divisors is an integer number (61973791).

Almost surely, 2^123947581 is an apocalyptic number.

It is an amenable number.

123947581 is a deficient number, since it is larger than the sum of its proper divisors (1).

123947581 is an equidigital number, since it uses as much as digits as its factorization.

123947581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 40.

The square root of 123947581 is about 11133.1747942804. The cubic root of 123947581 is about 498.5928180599.

The spelling of 123947581 in words is "one hundred twenty-three million, nine hundred forty-seven thousand, five hundred eighty-one".