8438549899931 has 2 divisors, whose sum is σ = 8438549899932. Its totient is φ = 8438549899930.

The previous prime is 8438549899837. The next prime is 8438549899943. The reversal of 8438549899931 is 1399989458348.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8438549899931 - 2³⁰ = 8437476158107 is a prime.

It is a super-2 number, since 2×8438549899931² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8438549899991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4219274949965 + 4219274949966.

It is an arithmetic number, because the mean of its divisors is an integer number (4219274949966).

Almost surely, 2^{8438549899931} is an apocalyptic number.

8438549899931 is a deficient number, since it is larger than the sum of its proper divisors (1).

8438549899931 is an equidigital number, since it uses as much as digits as its factorization.

8438549899931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2418647040, while the sum is 80.

The spelling of 8438549899931 in words is "eight trillion, four hundred thirty-eight billion, five hundred forty-nine million, eight hundred ninety-nine thousand, nine hundred thirty-one".