989131447 has 2 divisors, whose sum is σ = 989131448. Its totient is φ = 989131446.

The previous prime is 989131411. The next prime is 989131453. The reversal of 989131447 is 744131989.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989131447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 989131397 and 989131406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989131487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494565723 + 494565724.

It is an arithmetic number, because the mean of its divisors is an integer number (494565724).

Almost surely, 2^989131447 is an apocalyptic number.

989131447 is a deficient number, since it is larger than the sum of its proper divisors (1).

989131447 is an equidigital number, since it uses as much as digits as its factorization.

989131447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 989131447 is about 31450.4602033102. The cubic root of 989131447 is about 996.3639441216.

The spelling of 989131447 in words is "nine hundred eighty-nine million, one hundred thirty-one thousand, four hundred forty-seven".