988578491 has 2 divisors, whose sum is σ = 988578492. Its totient is φ = 988578490.

The previous prime is 988578463. The next prime is 988578517. The reversal of 988578491 is 194875889.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 988578491 - 2¹⁸ = 988316347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 988578491.

It is not a weakly prime, because it can be changed into another prime (988578431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494289245 + 494289246.

It is an arithmetic number, because the mean of its divisors is an integer number (494289246).

Almost surely, 2^988578491 is an apocalyptic number.

988578491 is a deficient number, since it is larger than the sum of its proper divisors (1).

988578491 is an equidigital number, since it uses as much as digits as its factorization.

988578491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5806080, while the sum is 59.

The square root of 988578491 is about 31441.6680696174. The cubic root of 988578491 is about 996.1782431143.

The spelling of 988578491 in words is "nine hundred eighty-eight million, five hundred seventy-eight thousand, four hundred ninety-one".