73613681 has 2 divisors, whose sum is σ = 73613682. Its totient is φ = 73613680.

The previous prime is 73613671. The next prime is 73613693. The reversal of 73613681 is 18631637.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70224400 + 3389281 = 8380^2 + 1841^2 .

It is an emirp because it is prime and its reverse (18631637) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73613681 - 2¹⁴ = 73597297 is a prime.

It is a super-2 number, since 2×73613681² = 10837948060739522, which contains 22 as substring.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (73613611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36806840 + 36806841.

It is an arithmetic number, because the mean of its divisors is an integer number (36806841).

Almost surely, 2^73613681 is an apocalyptic number.

It is an amenable number.

73613681 is a deficient number, since it is larger than the sum of its proper divisors (1).

73613681 is an equidigital number, since it uses as much as digits as its factorization.

73613681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 73613681 is about 8579.8415486534. The cubic root of 73613681 is about 419.1017860381.

It can be divided in two parts, 7361 and 3681, that multiplied together give a triangular number (27095841 = T₇₃₆₁).

The spelling of 73613681 in words is "seventy-three million, six hundred thirteen thousand, six hundred eighty-one".