972240989 has 2 divisors, whose sum is σ = 972240990. Its totient is φ = 972240988.

The previous prime is 972240977. The next prime is 972241019. The reversal of 972240989 is 989042279.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 744744100 + 227496889 = 27290^2 + 15083^2 .

It is an emirp because it is prime and its reverse (989042279) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 972240989 - 2⁸ = 972240733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (972240949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 486120494 + 486120495.

It is an arithmetic number, because the mean of its divisors is an integer number (486120495).

Almost surely, 2^972240989 is an apocalyptic number.

It is an amenable number.

972240989 is a deficient number, since it is larger than the sum of its proper divisors (1).

972240989 is an equidigital number, since it uses as much as digits as its factorization.

972240989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 972240989 is about 31180.7791596041. The cubic root of 972240989 is about 990.6600329393.

The spelling of 972240989 in words is "nine hundred seventy-two million, two hundred forty thousand, nine hundred eighty-nine".