993979489 has 2 divisors, whose sum is σ = 993979490. Its totient is φ = 993979488.

The previous prime is 993979487. The next prime is 993979513. The reversal of 993979489 is 984979399.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 674285089 + 319694400 = 25967^2 + 17880^2 .

It is a cyclic number.

It is not a de Polignac number, because 993979489 - 2¹ = 993979487 is a prime.

It is a super-2 number, since 2×993979489² = 1975990449105402242, which contains 22 as substring.

Together with 993979487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (993979487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496989744 + 496989745.

It is an arithmetic number, because the mean of its divisors is an integer number (496989745).

Almost surely, 2^993979489 is an apocalyptic number.

It is an amenable number.

993979489 is a deficient number, since it is larger than the sum of its proper divisors (1).

993979489 is an equidigital number, since it uses as much as digits as its factorization.

993979489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39680928, while the sum is 67.

The square root of 993979489 is about 31527.4402544831. The cubic root of 993979489 is about 997.9891220804.

The spelling of 993979489 in words is "nine hundred ninety-three million, nine hundred seventy-nine thousand, four hundred eighty-nine".