989472509 has 2 divisors, whose sum is σ = 989472510. Its totient is φ = 989472508.

The previous prime is 989472503. The next prime is 989472553. The reversal of 989472509 is 905274989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 752404900 + 237067609 = 27430^2 + 15397^2 .

It is a cyclic number.

It is not a de Polignac number, because 989472509 - 2⁴ = 989472493 is a prime.

It is a super-3 number, since 3×989472509³ (a number of 28 digits) contains 333 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989472503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494736254 + 494736255.

It is an arithmetic number, because the mean of its divisors is an integer number (494736255).

Almost surely, 2^989472509 is an apocalyptic number.

It is an amenable number.

989472509 is a deficient number, since it is larger than the sum of its proper divisors (1).

989472509 is an equidigital number, since it uses as much as digits as its factorization.

989472509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The square root of 989472509 is about 31455.8819459891. The cubic root of 989472509 is about 996.4784495732.

The spelling of 989472509 in words is "nine hundred eighty-nine million, four hundred seventy-two thousand, five hundred nine".