73121617 has 2 divisors, whose sum is σ = 73121618. Its totient is φ = 73121616.

The previous prime is 73121603. The next prime is 73121663. The reversal of 73121617 is 71612137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42915601 + 30206016 = 6551^2 + 5496^2 .

It is an emirp because it is prime and its reverse (71612137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73121617 - 2¹¹ = 73119569 is a prime.

It is not a weakly prime, because it can be changed into another prime (73121017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36560808 + 36560809.

It is an arithmetic number, because the mean of its divisors is an integer number (36560809).

Almost surely, 2^73121617 is an apocalyptic number.

It is an amenable number.

73121617 is a deficient number, since it is larger than the sum of its proper divisors (1).

73121617 is an equidigital number, since it uses as much as digits as its factorization.

73121617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764, while the sum is 28.

The square root of 73121617 is about 8551.1178801371. The cubic root of 73121617 is about 418.1658815990.

The spelling of 73121617 in words is "seventy-three million, one hundred twenty-one thousand, six hundred seventeen".