73799981 has 2 divisors, whose sum is σ = 73799982. Its totient is φ = 73799980.

The previous prime is 73799969. The next prime is 73800053. The reversal of 73799981 is 18999737.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73788100 + 11881 = 8590^2 + 109^2 .

It is a cyclic number.

It is not a de Polignac number, because 73799981 - 2¹⁰ = 73798957 is a prime.

It is a super-2 number, since 2×73799981² = 10892874391200722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73799281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36899990 + 36899991.

It is an arithmetic number, because the mean of its divisors is an integer number (36899991).

Almost surely, 2^73799981 is an apocalyptic number.

It is an amenable number.

73799981 is a deficient number, since it is larger than the sum of its proper divisors (1).

73799981 is an equidigital number, since it uses as much as digits as its factorization.

73799981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 53.

The square root of 73799981 is about 8590.6915321178. The cubic root of 73799981 is about 419.4550396159.

The spelling of 73799981 in words is "seventy-three million, seven hundred ninety-nine thousand, nine hundred eighty-one".