73511813 has 2 divisors, whose sum is σ = 73511814. Its totient is φ = 73511812.

The previous prime is 73511777. The next prime is 73511831. The reversal of 73511813 is 31811537.

Together with next prime (73511831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50452609 + 23059204 = 7103^2 + 4802^2 .

It is a cyclic number.

It is not a de Polignac number, because 73511813 - 2¹⁶ = 73446277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73511833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36755906 + 36755907.

It is an arithmetic number, because the mean of its divisors is an integer number (36755907).

Almost surely, 2^73511813 is an apocalyptic number.

It is an amenable number.

73511813 is a deficient number, since it is larger than the sum of its proper divisors (1).

73511813 is an equidigital number, since it uses as much as digits as its factorization.

73511813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 29.

The square root of 73511813 is about 8573.9030202120. The cubic root of 73511813 is about 418.9083764777.

The spelling of 73511813 in words is "seventy-three million, five hundred eleven thousand, eight hundred thirteen".