38498887991 has 2 divisors, whose sum is σ = 38498887992. Its totient is φ = 38498887990.

The previous prime is 38498887981. The next prime is 38498887993. The reversal of 38498887991 is 19978889483.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 38498887991 - 2²² = 38494693687 is a prime.

It is a Sophie Germain prime.

Together with 38498887993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38498887993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19249443995 + 19249443996.

It is an arithmetic number, because the mean of its divisors is an integer number (19249443996).

Almost surely, 2^38498887991 is an apocalyptic number.

38498887991 is a deficient number, since it is larger than the sum of its proper divisors (1).

38498887991 is an equidigital number, since it uses as much as digits as its factorization.

38498887991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 250822656, while the sum is 74.

The spelling of 38498887991 in words is "thirty-eight billion, four hundred ninety-eight million, eight hundred eighty-seven thousand, nine hundred ninety-one".