39242678581 has 2 divisors, whose sum is σ = 39242678582. Its totient is φ = 39242678580.

The previous prime is 39242678557. The next prime is 39242678627. The reversal of 39242678581 is 18587624293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24203580625 + 15039097956 = 155575^2 + 122634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39242678581 is a prime.

It is a super-2 number, since 2×39242678581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39242678281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19621339290 + 19621339291.

It is an arithmetic number, because the mean of its divisors is an integer number (19621339291).

Almost surely, 2^39242678581 is an apocalyptic number.

It is an amenable number.

39242678581 is a deficient number, since it is larger than the sum of its proper divisors (1).

39242678581 is an equidigital number, since it uses as much as digits as its factorization.

39242678581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5806080, while the sum is 55.

The spelling of 39242678581 in words is "thirty-nine billion, two hundred forty-two million, six hundred seventy-eight thousand, five hundred eighty-one".