73717421 has 2 divisors, whose sum is σ = 73717422. Its totient is φ = 73717420.

The previous prime is 73717403. The next prime is 73717433. The reversal of 73717421 is 12471737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72420100 + 1297321 = 8510^2 + 1139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73717421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73717451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36858710 + 36858711.

It is an arithmetic number, because the mean of its divisors is an integer number (36858711).

Almost surely, 2^73717421 is an apocalyptic number.

It is an amenable number.

73717421 is a deficient number, since it is larger than the sum of its proper divisors (1).

73717421 is an equidigital number, since it uses as much as digits as its factorization.

73717421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8232, while the sum is 32.

The square root of 73717421 is about 8585.8849864181. The cubic root of 73717421 is about 419.2985665418.

The spelling of 73717421 in words is "seventy-three million, seven hundred seventeen thousand, four hundred twenty-one".