73024991981 has 2 divisors, whose sum is σ = 73024991982. Its totient is φ = 73024991980.

The previous prime is 73024991929. The next prime is 73024992013. The reversal of 73024991981 is 18919942037.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69559315081 + 3465676900 = 263741^2 + 58870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73024991981 is a prime.

It is a super-2 number, since 2×73024991981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73024991581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36512495990 + 36512495991.

It is an arithmetic number, because the mean of its divisors is an integer number (36512495991).

Almost surely, 2^73024991981 is an apocalyptic number.

It is an amenable number.

73024991981 is a deficient number, since it is larger than the sum of its proper divisors (1).

73024991981 is an equidigital number, since it uses as much as digits as its factorization.

73024991981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 53.

The spelling of 73024991981 in words is "seventy-three billion, twenty-four million, nine hundred ninety-one thousand, nine hundred eighty-one".