73981751 has 4 divisors (see below), whose sum is σ = 73999152. Its totient is φ = 73964352.

The previous prime is 73981729. The next prime is 73981757. The reversal of 73981751 is 15718937.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 73981751 - 2¹⁰ = 73980727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73981699 and 73981708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73981757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2390 + ... + 12396.

It is an arithmetic number, because the mean of its divisors is an integer number (18499788).

Almost surely, 2^73981751 is an apocalyptic number.

73981751 is a deficient number, since it is larger than the sum of its proper divisors (17401).

73981751 is a wasteful number, since it uses less digits than its factorization.

73981751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17400.

The product of its digits is 52920, while the sum is 41.

The square root of 73981751 is about 8601.2645000604. The cubic root of 73981751 is about 419.7991310832.

The spelling of 73981751 in words is "seventy-three million, nine hundred eighty-one thousand, seven hundred fifty-one".