73410721 has 2 divisors, whose sum is σ = 73410722. Its totient is φ = 73410720.

The previous prime is 73410703. The next prime is 73410749. The reversal of 73410721 is 12701437.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45373696 + 28037025 = 6736^2 + 5295^2 .

It is a cyclic number.

It is not a de Polignac number, because 73410721 - 2⁷ = 73410593 is a prime.

It is not a weakly prime, because it can be changed into another prime (73410751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36705360 + 36705361.

It is an arithmetic number, because the mean of its divisors is an integer number (36705361).

Almost surely, 2^73410721 is an apocalyptic number.

It is an amenable number.

73410721 is a deficient number, since it is larger than the sum of its proper divisors (1).

73410721 is an equidigital number, since it uses as much as digits as its factorization.

73410721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 73410721 is about 8568.0056605957. The cubic root of 73410721 is about 418.7162635329.

The spelling of 73410721 in words is "seventy-three million, four hundred ten thousand, seven hundred twenty-one".