39991000541 has 2 divisors, whose sum is σ = 39991000542. Its totient is φ = 39991000540.

The previous prime is 39991000501. The next prime is 39991000547. The reversal of 39991000541 is 14500019993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39326856100 + 664144441 = 198310^2 + 25771^2 .

It is a cyclic number.

It is not a de Polignac number, because 39991000541 - 2³⁰ = 38917258717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39991000547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19995500270 + 19995500271.

It is an arithmetic number, because the mean of its divisors is an integer number (19995500271).

Almost surely, 2^39991000541 is an apocalyptic number.

It is an amenable number.

39991000541 is a deficient number, since it is larger than the sum of its proper divisors (1).

39991000541 is an equidigital number, since it uses as much as digits as its factorization.

39991000541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 41.

The spelling of 39991000541 in words is "thirty-nine billion, nine hundred ninety-one million, five hundred forty-one", and thus it is an aban number.