83891388487 has 2 divisors, whose sum is σ = 83891388488. Its totient is φ = 83891388486.

The previous prime is 83891388467. The next prime is 83891388557. The reversal of 83891388487 is 78488319838.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83891388487 - 2²⁷ = 83757170759 is a prime.

It is a super-2 number, since 2×83891388487² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83891388407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41945694243 + 41945694244.

It is an arithmetic number, because the mean of its divisors is an integer number (41945694244).

Almost surely, 2^83891388487 is an apocalyptic number.

83891388487 is a deficient number, since it is larger than the sum of its proper divisors (1).

83891388487 is an equidigital number, since it uses as much as digits as its factorization.

83891388487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74317824, while the sum is 67.

The spelling of 83891388487 in words is "eighty-three billion, eight hundred ninety-one million, three hundred eighty-eight thousand, four hundred eighty-seven".