39528972181 has 2 divisors, whose sum is σ = 39528972182. Its totient is φ = 39528972180.

The previous prime is 39528972143. The next prime is 39528972209. The reversal of 39528972181 is 18127982593.

It is a happy number.

39528972181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20274912100 + 19254060081 = 142390^2 + 138759^2 .

It is a cyclic number.

It is not a de Polignac number, because 39528972181 - 2¹¹ = 39528970133 is a prime.

It is a super-2 number, since 2×39528972181² (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 (39528975181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19764486090 + 19764486091.

It is an arithmetic number, because the mean of its divisors is an integer number (19764486091).

Almost surely, 2^39528972181 is an apocalyptic number.

It is an amenable number.

39528972181 is a deficient number, since it is larger than the sum of its proper divisors (1).

39528972181 is an equidigital number, since it uses as much as digits as its factorization.

39528972181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 55.

It can be divided in two parts, 3952897 and 2181, that added together give a triangular number (3955078 = T₂₈₁₂).

The spelling of 39528972181 in words is "thirty-nine billion, five hundred twenty-eight million, nine hundred seventy-two thousand, one hundred eighty-one".