73681913 has 2 divisors, whose sum is σ = 73681914. Its totient is φ = 73681912.

The previous prime is 73681897. The next prime is 73681921. The reversal of 73681913 is 31918637.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57577744 + 16104169 = 7588^2 + 4013^2 .

It is a cyclic number.

It is not a de Polignac number, because 73681913 - 2⁴ = 73681897 is a prime.

It is not a weakly prime, because it can be changed into another prime (73681963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36840956 + 36840957.

It is an arithmetic number, because the mean of its divisors is an integer number (36840957).

Almost surely, 2^73681913 is an apocalyptic number.

It is an amenable number.

73681913 is a deficient number, since it is larger than the sum of its proper divisors (1).

73681913 is an equidigital number, since it uses as much as digits as its factorization.

73681913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 73681913 is about 8583.8169248884. The cubic root of 73681913 is about 419.2312335450.

The spelling of 73681913 in words is "seventy-three million, six hundred eighty-one thousand, nine hundred thirteen".