39880240181 has 2 divisors, whose sum is σ = 39880240182. Its totient is φ = 39880240180.

The previous prime is 39880240139. The next prime is 39880240187. The reversal of 39880240181 is 18104208893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32592886225 + 7287353956 = 180535^2 + 85366^2 .

It is a cyclic number.

It is not a de Polignac number, because 39880240181 - 2⁶ = 39880240117 is a prime.

It is a super-2 number, since 2×39880240181² (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 (39880240187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19940120090 + 19940120091.

It is an arithmetic number, because the mean of its divisors is an integer number (19940120091).

Almost surely, 2^39880240181 is an apocalyptic number.

It is an amenable number.

39880240181 is a deficient number, since it is larger than the sum of its proper divisors (1).

39880240181 is an equidigital number, since it uses as much as digits as its factorization.

39880240181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 39880240181 in words is "thirty-nine billion, eight hundred eighty million, two hundred forty thousand, one hundred eighty-one".