73512981 has 16 divisors (see below), whose sum is σ = 115315200. Its totient is φ = 46125504.

The previous prime is 73512977. The next prime is 73512983. The reversal of 73512981 is 18921537.

It is not a de Polignac number, because 73512981 - 2² = 73512977 is a prime.

It is a super-2 number, since 2×73512981² = 10808316751012722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73512983) 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 in 15 ways as a sum of consecutive naturals, for example, 79621 + ... + 80538.

It is an arithmetic number, because the mean of its divisors is an integer number (7207200).

Almost surely, 2^73512981 is an apocalyptic number.

It is an amenable number.

73512981 is a deficient number, since it is larger than the sum of its proper divisors (41802219).

73512981 is a wasteful number, since it uses less digits than its factorization.

73512981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160185 (or 160179 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 73512981 is about 8573.9711336113. The cubic root of 73512981 is about 418.9105950889.

The spelling of 73512981 in words is "seventy-three million, five hundred twelve thousand, nine hundred eighty-one".