38541231991 has 2 divisors, whose sum is σ = 38541231992. Its totient is φ = 38541231990.

The previous prime is 38541231983. The next prime is 38541232069. The reversal of 38541231991 is 19913214583.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38541231991 - 2³ = 38541231983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38541231901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19270615995 + 19270615996.

It is an arithmetic number, because the mean of its divisors is an integer number (19270615996).

Almost surely, 2^38541231991 is an apocalyptic number.

38541231991 is a deficient number, since it is larger than the sum of its proper divisors (1).

38541231991 is an equidigital number, since it uses as much as digits as its factorization.

38541231991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 46.

The spelling of 38541231991 in words is "thirty-eight billion, five hundred forty-one million, two hundred thirty-one thousand, nine hundred ninety-one".