73045981 has 2 divisors, whose sum is σ = 73045982. Its totient is φ = 73045980.

The previous prime is 73045961. The next prime is 73045997. The reversal of 73045981 is 18954037.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69305625 + 3740356 = 8325^2 + 1934^2 .

It is an emirp because it is prime and its reverse (18954037) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73045981 - 2¹¹ = 73043933 is a prime.

It is a super-2 number, since 2×73045981² = 10671430680504722, which contains 22 as substring.

It is equal to p_4286638 and since 73045981 and 4286638 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73045981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73045961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36522990 + 36522991.

It is an arithmetic number, because the mean of its divisors is an integer number (36522991).

Almost surely, 2^73045981 is an apocalyptic number.

It is an amenable number.

73045981 is a deficient number, since it is larger than the sum of its proper divisors (1).

73045981 is an equidigital number, since it uses as much as digits as its factorization.

73045981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 73045981 is about 8546.6941562220. The cubic root of 73045981 is about 418.0216501687.

The spelling of 73045981 in words is "seventy-three million, forty-five thousand, nine hundred eighty-one".