1009999973 has 2 divisors, whose sum is σ = 1009999974. Its totient is φ = 1009999972.

The previous prime is 1009999957. The next prime is 1009999979. The reversal of 1009999973 is 3799999001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 689482564 + 320517409 = 26258^2 + 17903^2 .

It is a cyclic number.

It is not a de Polignac number, because 1009999973 - 2⁴ = 1009999957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1009999979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 504999986 + 504999987.

It is an arithmetic number, because the mean of its divisors is an integer number (504999987).

Almost surely, 2^1009999973 is an apocalyptic number.

It is an amenable number.

1009999973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1009999973 is an equidigital number, since it uses as much as digits as its factorization.

1009999973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1240029, while the sum is 56.

The square root of 1009999973 is about 31780.4967393526. The cubic root of 1009999973 is about 1003.3222746016.

The spelling of 1009999973 in words is "one billion, nine million, nine hundred ninety-nine thousand, nine hundred seventy-three".