39132906581 has 2 divisors, whose sum is σ = 39132906582. Its totient is φ = 39132906580.

The previous prime is 39132906523. The next prime is 39132906623. The reversal of 39132906581 is 18560923193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37812747025 + 1320159556 = 194455^2 + 36334^2 .

It is an emirp because it is prime and its reverse (18560923193) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39132906581 is a prime.

It is a super-2 number, since 2×39132906581² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39132306581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19566453290 + 19566453291.

It is an arithmetic number, because the mean of its divisors is an integer number (19566453291).

Almost surely, 2^39132906581 is an apocalyptic number.

It is an amenable number.

39132906581 is a deficient number, since it is larger than the sum of its proper divisors (1).

39132906581 is an equidigital number, since it uses as much as digits as its factorization.

39132906581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 39132906581 in words is "thirty-nine billion, one hundred thirty-two million, nine hundred six thousand, five hundred eighty-one".