989911487 has 2 divisors, whose sum is σ = 989911488. Its totient is φ = 989911486.

The previous prime is 989911469. The next prime is 989911523. The reversal of 989911487 is 784119989.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 989911487 - 2²⁶ = 922802623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989911427) 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, 494955743 + 494955744.

It is an arithmetic number, because the mean of its divisors is an integer number (494955744).

Almost surely, 2^989911487 is an apocalyptic number.

989911487 is a deficient number, since it is larger than the sum of its proper divisors (1).

989911487 is an equidigital number, since it uses as much as digits as its factorization.

989911487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1306368, while the sum is 56.

The square root of 989911487 is about 31462.8588497613. The cubic root of 989911487 is about 996.6257898446.

The spelling of 989911487 in words is "nine hundred eighty-nine million, nine hundred eleven thousand, four hundred eighty-seven".