989953493 has 2 divisors, whose sum is σ = 989953494. Its totient is φ = 989953492.

The previous prime is 989953477. The next prime is 989953499. The reversal of 989953493 is 394359989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 989920369 + 33124 = 31463^2 + 182^2 .

It is an emirp because it is prime and its reverse (394359989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989953493 - 2⁴ = 989953477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989953499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494976746 + 494976747.

It is an arithmetic number, because the mean of its divisors is an integer number (494976747).

Almost surely, 2^989953493 is an apocalyptic number.

It is an amenable number.

989953493 is a deficient number, since it is larger than the sum of its proper divisors (1).

989953493 is an equidigital number, since it uses as much as digits as its factorization.

989953493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9447840, while the sum is 59.

The square root of 989953493 is about 31463.5263916809. The cubic root of 989953493 is about 996.6398866170.

The spelling of 989953493 in words is "nine hundred eighty-nine million, nine hundred fifty-three thousand, four hundred ninety-three".