813540073 has 2 divisors, whose sum is σ = 813540074. Its totient is φ = 813540072.

The previous prime is 813540031. The next prime is 813540121. The reversal of 813540073 is 370045318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 653466969 + 160073104 = 25563^2 + 12652^2 .

It is a cyclic number.

It is not a de Polignac number, because 813540073 - 2²⁹ = 276669161 is a prime.

It is not a weakly prime, because it can be changed into another prime (813540023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406770036 + 406770037.

It is an arithmetic number, because the mean of its divisors is an integer number (406770037).

Almost surely, 2^813540073 is an apocalyptic number.

It is an amenable number.

813540073 is a deficient number, since it is larger than the sum of its proper divisors (1).

813540073 is an equidigital number, since it uses as much as digits as its factorization.

813540073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 813540073 is about 28522.6238800009. The cubic root of 813540073 is about 933.5257818998.

The spelling of 813540073 in words is "eight hundred thirteen million, five hundred forty thousand, seventy-three".