988612991 has 2 divisors, whose sum is σ = 988612992. Its totient is φ = 988612990.

The previous prime is 988612949. The next prime is 988613011. The reversal of 988612991 is 199216889.

It is a strong prime.

It is an emirp because it is prime and its reverse (199216889) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-988612991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988612901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494306495 + 494306496.

It is an arithmetic number, because the mean of its divisors is an integer number (494306496).

Almost surely, 2^988612991 is an apocalyptic number.

988612991 is a deficient number, since it is larger than the sum of its proper divisors (1).

988612991 is an equidigital number, since it uses as much as digits as its factorization.

988612991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 53.

The square root of 988612991 is about 31442.2166998448. The cubic root of 988612991 is about 996.1898313864.

The spelling of 988612991 in words is "nine hundred eighty-eight million, six hundred twelve thousand, nine hundred ninety-one".