73917989909 has 2 divisors, whose sum is σ = 73917989910. Its totient is φ = 73917989908.

The previous prime is 73917989807. The next prime is 73917989911. The reversal of 73917989909 is 90998971937.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42889167409 + 31028822500 = 207097^2 + 176150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73917989909 is a prime.

Together with 73917989911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73917980909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36958994954 + 36958994955.

It is an arithmetic number, because the mean of its divisors is an integer number (36958994955).

Almost surely, 2^73917989909 is an apocalyptic number.

It is an amenable number.

73917989909 is a deficient number, since it is larger than the sum of its proper divisors (1).

73917989909 is an equidigital number, since it uses as much as digits as its factorization.

73917989909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69441624, while the sum is 71.

The spelling of 73917989909 in words is "seventy-three billion, nine hundred seventeen million, nine hundred eighty-nine thousand, nine hundred nine".