1009998973 has 2 divisors, whose sum is σ = 1009998974. Its totient is φ = 1009998972.

The previous prime is 1009998971. The next prime is 1009998991. The reversal of 1009998973 is 3798999001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 762974884 + 247024089 = 27622^2 + 15717^2 .

It is a cyclic number.

It is not a de Polignac number, because 1009998973 - 2¹ = 1009998971 is a prime.

It is a super-2 number, since 2×1009998973² = 2040195850922109458, which contains 22 as substring.

Together with 1009998971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1009998971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504999486 + 504999487.

It is an arithmetic number, because the mean of its divisors is an integer number (504999487).

Almost surely, 2^1009998973 is an apocalyptic number.

It is an amenable number.

1009998973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009998973 is an equidigital number, since it uses as much as digits as its factorization.

1009998973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 55.

The square root of 1009998973 is about 31780.4810064291. The cubic root of 1009998973 is about 1003.3219434720.

The spelling of 1009998973 in words is "one billion, nine million, nine hundred ninety-eight thousand, nine hundred seventy-three".