947498989 has 2 divisors, whose sum is σ = 947498990. Its totient is φ = 947498988.

The previous prime is 947498983. The next prime is 947499013. The reversal of 947498989 is 989894749.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 940955625 + 6543364 = 30675^2 + 2558^2 .

It is an emirp because it is prime and its reverse (989894749) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 947498989 - 2¹⁷ = 947367917 is a 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 (947498983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 473749494 + 473749495.

It is an arithmetic number, because the mean of its divisors is an integer number (473749495).

Almost surely, 2^947498989 is an apocalyptic number.

It is an amenable number.

947498989 is a deficient number, since it is larger than the sum of its proper divisors (1).

947498989 is an equidigital number, since it uses as much as digits as its factorization.

947498989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47029248, while the sum is 67.

The square root of 947498989 is about 30781.4715210303. The cubic root of 947498989 is about 982.1841431921.

The spelling of 947498989 in words is "nine hundred forty-seven million, four hundred ninety-eight thousand, nine hundred eighty-nine".