1973351509 has 2 divisors, whose sum is σ = 1973351510. Its totient is φ = 1973351508.

The previous prime is 1973351441. The next prime is 1973351519. The reversal of 1973351509 is 9051533791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1955585284 + 17766225 = 44222^2 + 4215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1973351509 - 2¹⁷ = 1973220437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1973351519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986675754 + 986675755.

It is an arithmetic number, because the mean of its divisors is an integer number (986675755).

Almost surely, 2^1973351509 is an apocalyptic number.

It is an amenable number.

1973351509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1973351509 is an equidigital number, since it uses as much as digits as its factorization.

1973351509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127575, while the sum is 43.

The square root of 1973351509 is about 44422.4212419809. The cubic root of 1973351509 is about 1254.3001783957.

The spelling of 1973351509 in words is "one billion, nine hundred seventy-three million, three hundred fifty-one thousand, five hundred nine".