73017981 has 6 divisors (see below), whose sum is σ = 105470430. Its totient is φ = 48678648.

The previous prime is 73017979. The next prime is 73017991. The reversal of 73017981 is 18971037.

It can be written as a sum of positive squares in only one way, i.e., 65367225 + 7650756 = 8085^2 + 2766^2 .

It is not a de Polignac number, because 73017981 - 2¹ = 73017979 is a prime.

It is a super-2 number, since 2×73017981² = 10663251098632722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73017961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4056546 + ... + 4056563.

It is an arithmetic number, because the mean of its divisors is an integer number (17578405).

Almost surely, 2^73017981 is an apocalyptic number.

It is an amenable number.

73017981 is a deficient number, since it is larger than the sum of its proper divisors (32452449).

73017981 is a wasteful number, since it uses less digits than its factorization.

73017981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8113115 (or 8113112 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 73017981 is about 8545.0559389626. The cubic root of 73017981 is about 417.9682312951.

The spelling of 73017981 in words is "seventy-three million, seventeen thousand, nine hundred eighty-one".