12581973 has 10 divisors (see below), whose sum is σ = 18795414. Its totient is φ = 8387928.

The previous prime is 12581963. The next prime is 12581977. The reversal of 12581973 is 37918521.

12581973 is a `hidden beast` number, since 1 + 2 + 581 + 9 + 73 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11819844 + 762129 = 3438^2 + 873^2 .

It is not a de Polignac number, because 12581973 - 2⁶ = 12581909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12581977) 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 in 9 ways as a sum of consecutive naturals, for example, 77586 + ... + 77747.

Almost surely, 2^12581973 is an apocalyptic number.

It is an amenable number.

12581973 is a deficient number, since it is larger than the sum of its proper divisors (6213441).

12581973 is an equidigital number, since it uses as much as digits as its factorization.

12581973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155345 (or 155336 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 12581973 is about 3547.1076950101. The cubic root of 12581973 is about 232.5856500254.

The spelling of 12581973 in words is "twelve million, five hundred eighty-one thousand, nine hundred seventy-three".