991487671379 has 2 divisors, whose sum is σ = 991487671380. Its totient is φ = 991487671378.

The previous prime is 991487671301. The next prime is 991487671393. The reversal of 991487671379 is 973176784199.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991487671379 - 2⁸ = 991487671123 is a prime.

It is not a weakly prime, because it can be changed into another prime (991487670379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495743835689 + 495743835690.

It is an arithmetic number, because the mean of its divisors is an integer number (495743835690).

Almost surely, 2^991487671379 is an apocalyptic number.

991487671379 is a deficient number, since it is larger than the sum of its proper divisors (1).

991487671379 is an equidigital number, since it uses as much as digits as its factorization.

991487671379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144027072, while the sum is 71.

The spelling of 991487671379 in words is "nine hundred ninety-one billion, four hundred eighty-seven million, six hundred seventy-one thousand, three hundred seventy-nine".